lodash

I was trying to find the fastest way of running a for loop with its own scope. The three methods I compared were: var a = "t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t,t".split(); // lodash .each -> 1,294,971 ops/sec lodash.each(a, function(item) { cb(item); }); // native .forEach -> 398,167 ops/sec a.forEach(function(item) { cb(item); }); // native for -> 1,140,382 ops/sec var lambda = function(item) { cb(item); }; for (var ix = 0, len = a.length; ix < len; ix++) { lambda(a[ix]); } This is on Chrome 29 on OS X. You can run the tests

Using webpack, I'm trying to import isEqual since lodash seems to be importing everything. I've tried doing the following with no success: import { isEqual } from 'lodash' import isEqual from 'lodash/lang' import isEqual from 'lodash/lang/isEqual' import { isEqual } from 'lodash/lang' import { isEqual } from 'lodash/lang' You can install lodash.isequal as a single module without installing the whole lodash package like so: npm install --save lodash.isequal When using ECMAScript 5 and CommonJS modules, you then import it like this: var isEqual = require('lodash.isequal'); Using ES6 modules,

I would like to filter a collection using array of property value. Given an array of IDs, return objects with matching IDs. Is there any shortcut method using lodash / underscore ? var collections = [{ id: 1, name: 'xyz' }, { id: 2, name: 'ds' }, { id: 3, name: 'rtrt' }, { id: 4, name: 'nhf' }, { id: 5, name: 'qwe' }]; var ids = [1,3,4]; // This works, but any better way? var filtered = _.select(collections, function(c){ return ids.indexOf(c.id) != -1 }); jessegavin If you're going to use this sort of pattern a lot, you could create a mixin like the following, though, it isn't doing anything

I had a pull request feedback below, just wondering which way is the correct way to import lodash? You'd better do import has from 'lodash/has'.. For the earlier version of lodash (v3) which by itself is pretty heavy, we should only import a specidic module/function rather than importing the whole lodash library. Not sure about the newer version (v4). import has from 'lodash/has'; vs import { has } from 'lodash'; Thanks Bruce import has from 'lodash/has'; is better because lodash holds all it's functions in a single file, so rather than import the whole 'lodash' library at 100k, it's better to

I read the source code of lo-dash , and find there is fast alternative the function apply() here . function apply(func, thisArg, args) { switch (args.length) { case 0: return func.call(thisArg); case 1: return func.call(thisArg, args[0]); case 2: return func.call(thisArg, args[0], args[1]); case 3: return func.call(thisArg, args[0], args[1], args[2]); } return func.apply(thisArg, args); } I want to know is that really efficient way to implement the fast alternative function apply() ? Why there is no more than 3 args to decomposed here? Shaun You would need to bench test speed differences to be

I have the following structure: var output = [{ "article": "BlahBlah", "title": "Another blah" }, { "article": "BlahBlah", "title": "Return of the blah" }, { "article": "BlahBlah2", "title": "The blah strikes back" }, { "article": "BlahBlah2", "title": "The blahfather" }] From the above using an elegant lodash one-liner, I need to create the following structure. var newOutput = [{ "article": "BlahBlah", "titles": ["Another blah", "Return of the blah"] }, { "article": "BlahBlah2", "titles": ["The blah strikes back", "The blahfather"] }] Help as always, is greatly appreciated.. A huge plus for

This question already has an answer here: Generate unique number within range (0 - X), keeping a history to prevent duplicates 4 answers I use the following code to get random value from specifed range var provideRanges = function(){ var aa = []; _.times(3, function(i) { console.log(i); let num = _.random(10, 20) console.log("num = :" + num) debugger; aa.push(num); console.log("value is :" + aa[i]); }); } This is working and provide array of 3 values between the specified range when you call to this function, but the problem here become more difficult when I need that if I call it again ignore

I want to merge 4 array of object into one array For example: 4 arrays like var arr1 =[ { memberID : "81fs", RatingCW:4.5}, { memberID : "80fs", RatingCW:4}, { memberID : "82fs", RatingCW:5 }, { memberID : "83fs", RatingCW:3}, { memberID : "84fs", RatingCW:4.7} ]; var arr2 =[ { memberID : "80fs", ratingWW: 4}, { memberID : "81fs", ratingWW: 4.5}, { memberID : "83fs", ratingWW: 3}, { memberID : "82fs", ratingWW: 5}, { memberID : "84fs", ratingWW: 3.5} ]; var arr3 = [ { memberID : "80fs", incoCW:4}, { memberID : "81fs", incoCW:4.5}, { memberID : "82fs", incoCW:5}, { memberID : "83fs", incoCW:3},