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Extending Lodash

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[前端(javascript) 所属分类 前端(javascript) | 发布者 店小二04 | 时间 2016 | 作者 红领巾 ] 0人收藏点击收藏

In a lot of my posts I talked about the general implementations and usage of various Lodash methods. So this post covers Lodash extensions. It uses a Node.js syntax since I can easily show all the code involved. Firstly, here is a simple example that demonstrates how to add a function that can create an object from 2 arguments:

var _ = require('lodash'); _.mixin({ objOf: function(key, value) { var obj = {}; obj[key] = value; return obj; } }); function seedObjectPropertyArray(property, length) { return Array.apply(null, Array(length)).map(function(ele, index) { return _.objOf(property, index); }); } console.log(seedObjectPropertyArray('property1', 4)); // [ { property1: 0 }, // { property1: 1 }, // { property1: 2 }, // { property1: 3 } ]

If the object takes a collection and returns it, it can be included in chains:

_.mixin({ // Only handles arrays, since this is for demonstration purposes removeLast: function(arr) { return arr.slice(0, -1); } }); var result = _([1,2,3]).reverse() .removeLast() .value(); console.log(result); // [3, 2]

This _.mixin behavior also occurs across require . For example, if the above was saved in extendLodash.js and a file containing the below was used, the properties are still extended:

var _ = require('lodash'); // Run through all of extendLodash.js require('./extendLodash'); console.log(_.objOf('property1', 'value1')); // { property1: 'value1' }

Finally, it is usually a good idea to create a new version of Lodash that has extended properties that only your code uses. This avoids conflicts with other libraries that could extend Lodash behavior:

var lodash = _.runInContext(); lodash.mixin({ sayHello: function() { return 'hello' } }); console.log(lodash.sayHello + ''); // function () { // return 'hello' // } console.log(_.sayHello + ''); // undefined

Github Location: https://github.com/Jacob-Friesen/obscurejs/blob/master/2016/extendLodash.js

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