In this lesson we write an imperative function to flatten nested arrays, and then use the popular map, reduce, compose, and pipe functions to transform it into a high-level, point-free, functional implementation. , [, ], [[, [, [], ], [, ]]]]; const…

Among the features introduced to the language of JavaScript in ES2019 is Array.prototype.flat. In this lesson we'll see just how easy the flat method makes the process of unboxing arrays regardless of how deeply nested they may be. Deep flatten: , ,…

1.Arrays数组对象的创建方式 方式一: var 变量名=new Array(); //创建一个长度为0的数组. 方式二: var 变量名=new Array(长度); //创建一个指定长度的数组对象 方式三: var 变量名=new Array("元素1","元素2".......);//注意:这里是“小括号”,而不是“花括号”.和java不一样 方式四: var 变量名=["元素1","元素2","元素3&q…

In this lesson, we'll grab arrays of values from other arrays, resulting in a nested array. From there, we'll look at multiple ways to flatten the array structure using composition with map and unnest and then refactoring to use chain, AKA flatMap. F…

A common problem when dealing with some kinds of data is that not every object has the same nested structure. lukeskywalker.parents.father.isjedi works, but anakinskywalker.parents.father.isjedi throws an exception, because anakin_skywalker.parents.f…

Just like the State ADT an Array is also an Applicative Functor. That means we can do the same tricks with liftA2 with Array that we have been doing with State. While the Applicative aspect of State allows use to combine multiple stateful transitions…

/*! * jQuery JavaScript Library v3.2.1 * https://jquery.com/ * * Includes Sizzle.js * https://sizzlejs.com/ * * Copyright JS Foundation and other contributors * Released under the MIT license * https://jquery.org/license * * Date: 2017-03-20T18:59Z *…

307down votefavorite 93 Do you know a fast and simple way to encode a Javascript Object into a string that I can pass via a GET Request? No jQuery, no other frameworks - just plain Javascript :) javascript query-string urlencode shareimprove this que…

今天意外地发现JavaScript是不能用==或===操作符直接比较两个数组是否相等的. alert([]==[]); // false alert([]===[]); // false 以上两句代码都会弹出false. 因为JavaScript里面Array是对象,==或===操作符只能比较两个对象是否是同一个实例,也就是是否是同一个对象引用.目前JavaScript没有内置的操作符判断对象的内容是否相同. 但是惯性思维让人以为数组也是值,是可以比较的. 如果要比较数组是否相等,就只能遍历数组…

In addition to flat Arrays, programmers must often deal with nested Arrays. For example let's say we have an Array of stock exchanges, each of which is represented by an array of all the stocks listed on that exchange. If we were looking for a stock…