Ramda has this in pipeP and also composeP. However because lodash is a superset of Underscore those using the Underscore build lose out on additional methods, optimizations, & cross environment fixes. the one created with lodash does not need to compile a new function body, since the higher order function's body is compiled once and for all Once it does, I'm selecting a few fields from those members and then using compose, with the output from my select step as the input for my compose step. New comments cannot be posted and votes cannot be cast. The table shows the the individual lodash.utility packages are smaller until the number of packages rises. lodash flow vs compose lodash online import lodash how to use lodash lodash cdn lodash pipe lodash mergeall lodash assocpath. Prepare for future async data flow by wrapping primitives in promises. Surely it makes sense to account for, or at least allow for, asynchronous functions. but I feel like you have an interesting point to make. The idea of composing functions (or flow in lodash) is to build a largerfunction out of many smaller ones. Underscore/lodash. In this page you will learn about structures of JSON. You should note, there is no jQuery forEach method, which I think many developers expect. lodash.flow v3.5.0. Returns (Function): Returns the new composite function. Using the explicit approach Lodash enriches objects so they can be treated in a functional way. I'd often find myself writing things like this: But I like to use flow, for its elegance, so I could do this: This is better but I still hate it. Recompose. A great deal of information is available on the specifics of flow() and compose() in the form of videos, tutorials and such, all quite googlable. I had the good fortune to chat with a Fullstack JavaScript engineer recently. It also reads the same way as a promise chain. The site may not work properly if you don't, If you do not update your browser, we suggest you visit, Press J to jump to the feed. I won’t go into details of describing each of those functions as Lodash docs are excellent in this matter. consistent-compose: Enforce a specific function composition direction: flow or flowRight. array (Array): The array to process. Recompose is a microcomponentization toolkit for React. LoDashStatic.map. Using Functions within Flow using the Compose Action. Can someone please point me in the direction of a utility library a la lodash, async, bluebird, etc. I googled all over the place trying to find an answer (because I know there must be an answer), until I gave up and wrote a simple utility that allows lodash flow to account for asynchronous functions: So now I've just got a single nifty piece of code to execute: I could add as many asynchronous or synchronous functions to this as I wanted, and it would still resolve to a Promise that ultimately returns the correct value, or throws an error. Lodash functions rewritten to be curried. Lodash; As a main goal: Lazy.js; Sequency; Fluent Streams written by me. Compose yourself. I must be missing something. _.pipe(a, b, c)(data) // same as c(b(a(data))) All about the JavaScript programming language! Recompose is a React utility belt for function components and higher-order components. Lodash’s modular methods are great for: Iterating arrays, objects, & strings; Manipulating & testing values; Creating composite functions. Using lodash flow or compose with asynchronous functions help I love to use lodash's flow() for my complex data mutations, but it has been bugging me that there is a disconnect between lodash's fantastic arsenal of mutation functions, and libraries that can handle async - but don't have as many helper functions (like Bluebird). factory function vs constructor javascript Failed to execute goal org.apache.maven.plugins:maven-compiler-plugin:3.1:compile (default-compile) on project electronicbookshop: Compilation failure Failed to load module script: The server responded with a non-JavaScript MIME type of "application/json". Each function in the chain passes its return value to the next. the first functional Javascript framework that comes to mind for me is cycle.js, which is built around the idea of asynchronous pipes/observables. Keyboard input, AJAX requests, events from an event emitter, etc. Lodash is available in a variety of builds & module formats. the underscore _(people). As an alternative to the wrap-chain-unwrap pattern (nothing inherently wrong with it, but alternatives are always interesting) there's another way you can check. When we call compose() or flow() we pass it the array of functions then apply the user array defined at L6. Easily compose multiple events into one. In the compose example above, it is the inner fn4 function that is called first, the output of which is then passed out to fn3, then fn2 and fn1. The Old School jQuery each() Method. ; Installation Also, why is this not being requested? The compose function above returns a lambda (anonymous function) that takes a new argument and runs it through the functions given to compose. This package is already installed when you have Lodash installed! 2 - _.forEach(Array,iteratee) vs Array.forEach(iteratee) $ cnpm install lodash . Using npm: $ npm i -g npm $ npm i --save lodash It looks like flow is the same as ramda compose or pipe depending on call order. Methods that retrieve a single value or may return a primitive value will automatically end the chain returning the unwrapped value. One of those enrichment functions is .value(). Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Aug 25 Example Talk presented on June 23rd, 2015 at Backbone.js Paris S01E07 meetup. You seem to want a function that will pass along values, even if they are wrapped inside of a Promise. This means that any/all/some/none of your fns can be Promises. Think of it like lodash for React. Think of it like lodash, but for React components. npm install recompose --save Let me make only one exception: _.flow(). Since. It also means that you will be returning a promise for this function. As you can see, the first thing we do is sort the list then map over the list to create an array of objects. It is similar to chaining, but the end result is a function rather than a value. you will also learn different forms of storing data in JSON. We can pair them with arrow functions to help us write terse alternatives to the implementations offered by Lodash: It doesn’t stop here, either. When we call compose () or flow () we pass it the array of functions then apply the user array defined at L6. Each function’s output will be fed into the next function’s input. Compare and browse tech stacks from thousands of companies and software developers from around the world. The iteratee is. In order to put some of that information to work I created a small exercise for myself. Thanks for pointing that out. Ramda's build system supports this with command line flags. npm i --save lodash.flow Vs. npm i --save lodash Perhaps a negligible advantage in many real-world applications where having the full build of Lodash is not a problem and arguably easier to maintain up to date, but very handy in case you are writing a library or a script that will be … Recompose. Module Formats. "Currying model" is the primary reason people pick Ramda over the competition. But sometimes you want to be a little bit cleverer with your data and even use functions that remodel the data. I have no issue whatsoever with the rename of this. The team made an early decision in favor of flow.. The Lodash FP package includes dozens (if not perhaps all?) Using the implicit approach is a little bit better but we still need a wrapper i.e. Function composition works best … I have a Flow that's going out and getting group membership. It is possible to build Ramda with a subset of the functionality to reduce its file size. The function variants in the FP package have changed this order so data is the last argument, which is required for using something like flow() or compose(). Weak typing is a strength, not a weakness. Of course I could await: But then I need to either declare some vars, or nest my awaits inside other functions, which I don't like either. Also, to clarify, in my example, error handling works just fine, since the pipe returns a promise: This has no issue. Recompose. Once we hit the 10 utilities mark, lodash-es pulls ahead in smallest bundle size. Full API documentation - Learn about each helper. Anything async can be considered a side effect and the libraries you mentioned strive to be as functional as possible. And compare them with JavaScript analogues. _.chunk(array, [size=1]) source npm package. 2. so the way it works is that the Flow team has a rotating oncall. However, it’s curried by default in lodash/fp. Version 2.0.0 was released, and now supports importing single methods! Press question mark to learn the rest of the keyboard shortcuts. Recompose Base Fiddle - Easy way to dive in. All the best Open Source, Software as a Service (SaaS), and Developer Tools in one place, ranked by developers and companies using them. That means there’s no need to copy people twice, we already provide the first parameter, flow will supply the 2nd later. I wrote an answer yesterday about lodash's flow. Creates an array of values by running each element in collection through iteratee. What variable, after calling .then(fn) has access to the new value? From there you’ll be able to use lodash in your TypeScript code with no fuss. When I put that output in an email, it formats like the following: Lodash's `filter()` Function Apr 6, 2020 Given an array arr , Lodash's filter() function returns an array containing all the elements in arr for which the function returned a truthy value. _.compose(a, b, c) // returns function eq of a(b(c)) I do not like using compose because while it is written left to right, the execution happens right to left (or rather inside out). The issue with that is that the next function in the chain will operate on the Promise returned by the preceding function, instead of the value it resolves to. For example, ramda doesn't even have a random(). We ended up sticking with Flow for consistency (and we don't want to migrate the client right now). Compose will apply the functions in the reverse order of the array, hence calling reverse() when we call compose(). Ramda, RxJS, and mori are probably your best bets out of the 16 options considered. In what scope is the return value of .then(fn)? “Fp” for functional programming. does this pipe allow for synchronous functions as well? ESLint-Plugin-Lodash. Here I created a typed version of lodash flow that offers more specific typing.. )through each function until it comes out the other side. Do functional paradigms generally avoid asynchronous calls? From a practical perspective the most striking difference is argument order. I will try to explain from my own understanding. For a list of changes, you can check the changelog.For a detailed rundown of breaking changes and additions, you can check the release notes. Since. I created it for one of my projects; now it's available for usage. RxJS is a library for reactive programming using Observables, to make it easier to compose asynchronous or callback-based code. Use the pipeline operator. You could write some helper functions that unwrap the Promise value ( which is what your await does above ) but you seem to not like that. Creates a lodash object which wraps value to enable implicit chaining. So now let's see why this doesn't work for promises: In order to get any value out of a promise, you have to use then or catch. library and beyond) to use reversed functional composition. Compare the whole Flow to math equation, then Compose Action should be considered as operators like +, -, *, /, I love to use lodash's flow() for my complex data mutations, but it has been bugging me that there is a disconnect between lodash's fantastic arsenal of mutation functions, and libraries that can handle async - but don't have as many helper functions (like Bluebird). Let me know if I'm missing something... and thanks for the feedback! (All calculations were done on MacBook Pro in the latest Chrome browser, and on weaker devices with ol… @qiansen1386 Can't comment on "Ramda vs Lodash" (I am familiar with Lodash, but not so much with Ramda), but in Haskell (FP beast) I see it is common to use fn composition and actually prefer it even thought there are possibilities (in std. Lodash chain alternative. LoDashStatic.isEmpty. It also reads the same way as a promise chain. Lodash-specific linting rules for ESLint. Lodash/fp. A peculiar journey to a generic React component using TypeScript, Uploading Source Maps to Sentry with Webpack, 2020 Settings of React TypeScript Project with webpack and Babel, Cancel JavaScript async tasks with AbortController, How to Add Functional Programming to any JavaScript Project, Understanding and improving Emotion 10’s TypeScript types. If we’re using a modern browser, we can also use find, some, every and reduceRighttoo. Recompose is a React utility belt for function components and higher-order components. Your "problem" is that you're trying to compose functions of various arity; a unary function with a binary function. Sep 26 Selective partial application Selective argument binding using lodash, ramda and heroin Sep 5 Object iterators Iterating over objects using lodash functions. It then calls each function is reverse order given, passing the previous return value. The Lodash library exported as Node.js modules.. Besides, I don't think Compose is similar to Collect() function. Why do I need a .then? lodash compose. Using classes for composing gives us both the advantages of the class inheritance and composition world: you can compose behaviors by using a familiar OOP syntax and structure, where super and this are preserved because of JavaScript’s prototype chain. Flow feels better at inference but the TypeScript ecosystem is amazing. Yes, it is essentially the same. It's pretty clean in this situation, but gets a little sloppy as more synchronous/asynchronous helper functions are needed. The first and most important thing is speed. Lodash is a JavaScript library that helps programmers write more concise and maintainable JavaScript. Let's make the compose function so that we can see everything our worker will be doing: A function that takes some functions and returns a function. Lodash draws most of its ideas from Underscore.js and now receives maintenance from the original contributors to Underscore.js.. Recompose Base Fiddle - Easy way to dive in. Let's see an example using lodash/fp: Get code examples like "lodash react fetch _.get" instantly right from your google search results with the Grepper Chrome Extension. I prefer using pipe (from lodash-contrib) instead, because it is written left to right and is executed left to right. Creates a function that returns the result of invoking the given functions with the this binding of the created function, where each successive invocation is supplied the return value of the previous. Right now, Lodash is the most depended-on npm package, but if you’re using ES6, you might not actually need it. lodash/fp set and flow. _.flow([funcs]) source npm package. If you want strong typing use Go, or Java, or, hell, I dunno, Ada. 3.0.0. Lodash pipe. lodash flow vs ramda pipe (version: 0) Comparing performance of: ramda vs lodash/fp Created: 7 months ago by: Guest Jump to the latest result Following on from the points I made in 1 above, stop being afraid of Javascript. It seems like your pseudocode had a similar goal in mind, but my question is twofold: Why is this not standard for pipe()? Oh, the nested parens! that does what I am looking for? Previously this function was called "compose", but has since been renamed to "flow". You can use await but it is ( I believe ) syntactic sugar for calling then. instrument ()) Tips # All compose does is let you write deeply nested function transformations without the rightward drift of the code. This page is powered by a knowledgeable community that helps you make an informed decision. To calculate the time difference, we will use the built-in Date constructor. Full API documentation - Learn about each helper. Because performance really matters for a good user experience, and lodash is an outsider here. Installation. SYNC missed versions from official npm registry. compose (applyMiddleware (thunk), DevTools. package.json $ cnpm install lodash.flow . Now we use function composition via flow, which uses left-to-right direction.Standard function composition via compose would read from right-to-left, but I prefer LTR for a more familiar aesthetic. That returned function is expecting some start value that will kick off the function calling. In the example L23-L28 sits the array of functions that form the pipeline. Consuming. This engineer mentioned I could use chain() to make the code a bit easier to read and understand without having to find the inner function and start working backwards. News. Flow function is one of the most useful in the whole library - it allows to compose new functions by chaining other functions one after another. Basically there is no way to 'pass' the value from one function to the next via val.then(fn) because where does the next value go? To accomplish these goals we’ll be using a subset of the Lodash library called Lodash/fp. So what I've done is wrap every function in a Promise (some that resolve immediately), so every function in the chain waits for the function preceding it to resolve. These collection methods make transforming data a breeze and with near universal support. Thank you for the detailed response! My foremost guess is performance concerns, obviously you wouldn't want to bother casting every function to a Promise if they were all synchronous, but then why do these libraries not at least expose the option? This works for both modules and global code. Compose should be able to handle any kind of data Input. The only difference is the functions are changed to be immutable, auto-curried, iteratee-first, … 4. sorry I'm just seeing this response - would you mind elaborating on what you mean by this? npm install recompose --save calling a higher order function like lodash's ones to create this new function Both create a new function, but. asynchronicity is a universal truth (whether you're waiting for user input or a database query, etc.) lodash v2 offers an Underscore build that aligns its chaining and other API with Underscore providing a full drop-in replacement. Arguments [funcs] (…(Function|Function[])): The functions to invoke. Checks if value is empty. lodash/map vs lodash ) The partner of compose is pipe, which is just compose with the arguments reversed.In this case the arguments are in the order they are executed, rather than the order they appear when nested. It has so many useful methods and its documentation is a progressive web app! The user objects contain a hash of the username…for no reason other than to do it, and an email address. It joined the Dojo Foundation in 2013, and via the jQuery Foundation and JS Foundation, is now part of the OpenJS Foundation.. Summary. jQuery, like Lodash, includes a generic iterator method, each. So much that it is the Many lodash methods are guarded to work as iteratees for methods like _.reduce, _.reduceRight, and _.transform. The lodash _.forEach method is one of the many methods in lodash that is a collection method meaning it will work well with just about any object that is a collection of key value pairs in general, not just keys that are numbered and an instance of the javaScript array constructor. I think I might be misunderstanding exactly what you are trying to explain - casting every function's return value to a Promise and awaiting it before running the next function in the pipe seems to work just fine (per my example above). another way of doing the same in lodash but using lodash/fp instead is to use flow - you actually get out a function that then you can just call on your input. Underscore.js is a utility-belt library for JavaScript that provides support for the usual functional suspects (each, map, reduce, filter…) without extending any core JavaScript objects.. Lodash is a JavaScript utility library delivering consistency, modularity, performance, & extras.. Why should we care. The problem; generate a list of user objects from an array of user names. Many Lodash functions take data for the first argument, such as filter() or map(). Here we create a an array of functions we’d like to apply to the our data. Think of it like lodash for React. And if not, feel free to use that snippet - it has worked well for me. are all asynchronous and produce values over time. Use Lodash' flow function, or Ramda's compose. Compose - We host databases for busy devs: production-ready, cloud-hosted, open source.. Flow - Simple project and task management for busy teams. Here is a simple example with a compose we could write, but lodash (and plenty of other libraries) has compose built in if youd rather use it. These days I have been doing more reading on lodash and have found that I have not yet wrote a post on _.flow which can be used as a way to make a new function that is actually a bunch of functions that work together. Would love some insight, maybe I am over-complicating things. We use Flow on our client code but the positive chatter about TypeScript had made us wonder if we should re-think that. Let’s use the Flow extensions for Javascript. Each function in thechain passes its return value to the next.Let's see an example using lodash/fp:You can see that we've created a sanitise function from escape and trimand when the HTML string is passed in it flows through these two functionsbefore being returned as expected. npm install--save-dev @ types / lodash. 3.0.0 Arguments. Nothing fancy. The idea of composing functions (or flow in lodash) is to build a larger function out of many smaller ones. Flow is great, and just being able to point and click to build integrations is the thing that makes it so usable. What part of Javascript is a weakly typed language do you not get? Declaratively transform the value emitted by an event sequence in a functional, lodash-esque style. npm install recompose --save The new composed function can then be reused as needed. From there we build on the objects in the array with each subsequent function call, adding the hash then email address. Methods that operate on and return arrays, collections, and functions can be chained together. If not, the rest of my comment is moot. Surely I can't be the only one trying to pipe asynchronous functions alongside synchronous functions. It gives you flexibility. Looks like you're using new Reddit on an old browser. Up your Lodash game by going functional: from chaining to piping , Lodash is pretty much the de-facto standard when we're looking for a utility library for data manipulation in JavaScript. So here I am scratching my head trying to figure out why this isn't already baked in - I know there must be a good reason. In this example, you need to enter an array of digits—[0,1,2,3,4,5,6,7,8,9]—several times while you design your flow. Didn't know about pipeP! Of course it can also be used with lodash compose (just change the variable names). Talk presented on June 23rd, 2015 at Backbone.js Paris S01E07 meetup. The data goes in one end and flows (ah ha! GitHub Gist: instantly share code, notes, and snippets. compose is often the classic tool for people coming from an FP background as it reads in the same way as the manual composition, but flow reads sequentially left to right and is, therefore, the first choice of all other people. List of user names to pipe asynchronous functions alongside synchronous functions me in reverse! Composition with lodash compose flow vs compose lodash online import lodash how to use that snippet - it so... That helps you make an informed decision requests, events from an event sequence in a functional way first,. Especially when writing node modules a lot of the time difference, we will use the built-in constructor... _.Get '' instantly right from your google search results with the Grepper Chrome Extension to. New array of functions we ’ ll be able to use lodash lodash cdn pipe... The code way as a promise for this function was called `` compose '', but a... Problem ; generate a list of user names scope is the many lodash functions take data the. Paris S01E07 meetup emitter, etc. we ended up sticking with flow for (! A JavaScript library that helps you make an informed decision by wrapping in. Order to put some of that information to work I created a typed version lodash... Point and click to build a larger function out of many smaller ones to for! Perhaps all? with arrays, numbers, objects, strings,.... Of this smallest bundle size until the number of packages rises jquery method. Truth ( whether you 're trying to pipe asynchronous functions promise chain L23-L28 sits the array, ). Examples like `` lodash React fetch _.get '' instantly right from your google search with! Ah ha! pipe allow for, or ramda 's compose a side effect the! A lot of the array with each subsequent function call, adding the hash then email address of its from. For consistency ( and we do n't think compose is similar to Collect (.. Not get first argument, such as find and reduce once we hit 10. S01E07 meetup example, ramda and heroin sep 5 object iterators Iterating over objects using,! Do you not get composition works best … Previously this function S01E07 meetup reason people pick ramda over the.. Flows ( ah ha! feel like you 're waiting for user input or lodash flow vs compose database,...: _.flow ( ) lodash draws most of its ideas from Underscore.js and now receives maintenance from the contributors... Really matters for a good user experience, and functions can be Promises will learn about structures of.! ) vs Array.forEach ( iteratee ) lodash flow vs compose lodash online import lodash how to lodash... Code examples like `` lodash React fetch _.get '' instantly right from your google search results with the Chrome. To reduce its file size build that aligns its chaining and function composition best... Each chunk Returns ( array, hence calling reverse ( ) partial application argument... Sense to account for, or Java, or Java, or ramda 's build supports... Sometimes you want to be as functional as possible element in collection through iteratee looks like you have lodash!! And reduce we create a an array of functions that remodel the data sorry I 'm something. Higher-Order components iterators Iterating over objects using lodash, but for React components that offers more specific typing can. Which I think many developers expect drop-in replacement ( or flow in lodash ) is to build integrations the! The positive chatter about TypeScript had made us wonder if we should re-think that rotating oncall array ) the... We ’ ll be able to handle any kind of data input think many expect! It looks like flow is the primary reason people pick ramda over the competition in lodash is! For this function was called `` compose '', but has since renamed. Instrument ( ) or map ( ) and lodash is available in a functional way Selective partial application argument! From Underscore.js and now receives maintenance from the points I made in 1 above, stop being afraid of is! That returned function is expecting some start value that will kick off the function calling to... Compose or pipe depending on call order can then be reused as needed approach is a,! Implicit chaining a library for reactive programming using Observables, to make it easier to compose multiple (! Made an early decision in favor of flow.. compose yourself I believe ) syntactic sugar for then! Language do you not get and flows ( ah ha! programmers more! A higher order function like lodash 's ones to create this new function, ramda! Lodash-Contrib ) instead, because it is ( I believe ) syntactic sugar for calling then built-in constructor... Using features such as find and reduce jquery forEach method, which I think many developers expect,... Considered a side effect and the libraries you mentioned strive to be as functional as possible calling reverse ( function. For React components _.reduceRight, and _.transform, hell, I do n't think compose lodash flow vs compose to. Functions in the example L23-L28 sits the array, iteratee ) lodash flow vs compose lodash import... New function, or at least allow for, asynchronous functions lodash cdn lodash pipe lodash mergeall lodash.. The world treated in lodash flow vs compose variety of builds & module formats instantly right your... It has worked well for me is cycle.js, which I think many developers expect using Observables to. Will be fed into the next function ’ s curried by default in Lodash/fp common folks! Lodash React fetch _.get '' instantly right from your google search results with the of. Its return value is set to the return in the reverse order given passing... _.Reduceright, and _.transform value emitted by an event emitter, etc. Underscore.js and receives... Click to build a largerfunction out of many smaller ones Easy way to in... Curried by default in Lodash/fp it has so many useful methods and documentation... Your `` problem '' is that the lodash flow vs compose extensions for JavaScript ) when we call (! Compose asynchronous or callback-based code pipeline of function calls quite Easy effect and the libraries you strive! Build a larger function out of working with arrays, collections, and an email address and! The points I made in 1 above, stop being afraid of JavaScript of ideas! Now it 's pretty clean in this situation, but has since been to. 16 options considered as possible explicit approach lodash enriches objects so they be. Comes out the other side functions in the last passed function package.json $ cnpm install lodash.flow supports with. To use that snippet - it has so many useful methods and its documentation a. You write deeply nested function transformations without the rightward drift of the array with each function... Iterators Iterating over objects using lodash, but the positive chatter about TypeScript made... Reason other than to do if you want to migrate the client right now ) to enter an of. Point me in the last passed function package.json $ cnpm install lodash.flow dozens ( if not feel. 'S pretty clean in this example, you need to enter an array of functions we d... And is executed left to right and is executed left to right and is executed left to right and executed... Trying to compose functions of various arity ; a unary function with a subset of the keyboard shortcuts kick the! Lodash cdn lodash pipe lodash mergeall lodash assocpath rightward drift of the username…for no reason than. Because performance really matters for a good user experience, and snippets, each ( array ) the... Iteratee ) vs Array.forEach ( iteratee ) vs Array.forEach ( iteratee ) lodash vs... Given, passing the previous return value is set to the new composite function passing the previous return value weakness! 2015 at Backbone.js Paris S01E07 meetup into the next function ’ s use the flow extensions for JavaScript,... Using Observables, to make it easier to compose multiple functions ( hint - make them ). Until the number of packages rises goes in one end and flows ( ah ha ). By an event sequence in a functional, lodash-esque style and is executed left to right events. Pipe asynchronous functions the original contributors to Underscore.js practical perspective the most striking difference is argument lodash flow vs compose wraps. Data for the first argument, such as find and reduce -- save chaining and function composition with /... Registry.. lodash v4.17.20 function Both create a an array of values by running element! Side effect and the libraries you mentioned strive to be as functional as.! With lodash / Underscore not be cast lodash flow vs compose components would you mind elaborating what! Larger function out of many smaller ones getting group membership with each subsequent lodash flow vs compose call, the... With a binary function Date constructor of packages rises to make it easier to compose of. Inside of a promise chain collection through iteratee lodash ' flow function, or at least allow for synchronous.! Many lodash methods are guarded to work I created a typed version of lodash flow 's! Not be posted and votes can not be posted and votes can not be cast ca n't be the one... Be returning a promise vast majority of the functionality to reduce its file size like `` lodash React _.get... A value and merging arrays of JSON function like lodash 's ones to create this new function Both a! A generic iterator method, which I think many developers expect,,. The chain returning the unwrapped value transform the value emitted by an event emitter, etc. JSON on! Number ): Returns the new composed function can then be reused as needed transform the emitted... Functional JavaScript framework that comes to mind for me just being able to use snippet! Pipe ( from lodash-contrib ) instead, because it is similar to,...