_.transform() the object to another object, and while passing the values to the new object, check if the value is an object and if it has the ‘reach’ property, and if so use _.omit() to get a new object without reach: var obj = { total: 350, SN1: { reach: 200, engagementRate: 1.35 }, SN2: … Read more
Silver Spoon Evaluation We’ll just start with tracing the evaluation of addSquare(3, 1) // … Ok, here goes = flow([add, trace(‘after add’), square]) (3, 1) add(3,1) 4 trace(‘after add’) (4) tap(x => console.log(`== ${ ‘after add’ }: ${ x }`)) (4) curry((interceptor, n) => { interceptor(n); return n; }) (x => console.log(`== ${ ‘after add’ … Read more
Here are two vanilla javascript options: A.: Iterate over the object’s keys and delete those having a falsey value. var obj = { propA: true, propB: true, propC: false, propD: true, }; Object.keys(obj).forEach(key => { if (!obj[key]) delete obj[key]; }); console.log(obj); See Object.keys() and Array.prototype.forEach() B.: Iterate over the object’s keys and add truthy values … Read more
Debounce function should be defined somewhere outside of render method since it has to refer to the same instance of the function every time you call it as oppose to creating a new instance like it’s happening now when you put it in the onChangeText handler function. The most common place to define a debounce … Read more
Ah-ha! The Lodash Changelog says it all… “Removed _.pluck in favor of _.map with iteratee shorthand” var objects = [{ ‘a’: 1 }, { ‘a’: 2 }]; // in 3.10.1 _.pluck(objects, ‘a’); // → [1, 2] _.map(objects, ‘a’); // → [1, 2] // in 4.0.0 _.map(objects, ‘a’); // → [1, 2]
_.unionBy(): This method is like _.union except that it accepts iteratee which is invoked for each element of each arrays to generate the criterion by which uniqueness is computed. Result values are chosen from the first array in which the value occurs. var original = [ { label: ‘private’, value: ‘[email protected]’ }, { label: ‘work’, … Read more
You could filter it and search just for one occurence of the search string. Methods used: Array#filter, just for filtering an array with conditions, Object.keys for getting all property names of the object, Array#some for iterating the keys and exit loop if found, String#toLowerCase for getting comparable values, String#includes for checking two string, if one … Read more
Lodash has a _.pickBy function which does exactly what you’re looking for. var thing = { “a”: 123, “b”: 456, “abc”: 6789 }; var result = _.pickBy(thing, function(value, key) { return _.startsWith(key, “a”); }); console.log(result.abc) // 6789 console.log(result.b) // undefined <script src=”https://cdn.jsdelivr.net/lodash/4.16.4/lodash.min.js”></script>
lodash and ES5 var song = _.find(songs, {id:id}); lodash and ES6 let song = _.find(songs, {id}); docs at https://lodash.com/docs#find
I prefer to introduce ‘_’ globally and injectable for tests, see my answer to this question Use underscore inside controllers var myapp = angular.module(‘myApp’, []) // allow DI for use in controllers, unit tests .constant(‘_’, window._) // use in views, ng-repeat=”x in _.range(3)” .run(function ($rootScope) { $rootScope._ = window._; });