这里是用 JavaScript 做的逆转序列(数组/字符串)的递归/尾递归实现.另外还尝鲜用了一下 ES6 的destructuring assignment + spread operator 做了一个更 functional 的版本(只支持数组). 正确性能通过测试(参见 放在我 Github 上的 demo,顺手写了一个小小的测试框架),不过效率就要打问号了——特别是用了 ES6 特性的版本.这里主要是写来玩 JS 的函数式特性的. 1. 逆转序列的递归实现 先用 Haskell 实现做草…

解构赋值 Destructuring Assignment ES6中可以通过一定的模式将数组或对象中的值直接赋值给外部变量,称为解构 对象的解构赋值 // 在ES5中,当需要获取一个对象中的变量值的时候,不得不进行过如下操作 const person = { name: 'zhang', age: 18, hobby: 'coding' } let name = person.name; let age = person.age; let hobby = perosn.hobby; // do…

Destructuring Assignment In JavaScript 更省事,代码显得也清楚. Arrays 传统的声明赋值: let johnDoe = ["John", "Doe", "Iskolo"] let firstName = johnDoe[0] let lastName = johnDoe[1] let title = johnDoe[2] 现代声明和赋值使用:拆解JS中的分配(赋值) let johnDoe = [&qu…

[destructuring assignment] The destructuring assignment syntax is a JavaScript expression that makes it possible to extract data from arrays or objects into distinct variables. A variable can be assigned a default, in the case that the value pulled f…

Here is the way you get value from an object: var obj = { color: "blue" } console.log(obj.color); //blue Destructuring Assignment: Object Destructuring Assignment is somehow different: var {color} = { color: "green" } console.log(color…

ES6 Destructuring Assignment All In One ES6 & Destructuring Assignment Axios, vue https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment https://www.sitepoint.com/es6-destructuring-assignment/ https://jav…

Object Destructuring Assignment vs Object.assign // const params = Object.assign({}, this.$route.params, { menuKey: tab.name }); const params = { ...this.$route.params, ...{ menuKey: tab.name } }; obj1 = {K: 1} // {K: 1} obj2 = {v: 2} // {v: 2} param…

js destructuring assignment bug https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Destructuring_assignment const getShapeCenterPoint = (points = [], type = "object") => { // 设置旋转的 origin,为 polygon 的中心,旋转偏移量 let [top,…

Read More: http://es6.ruanyifeng.com/#docs/destructuring Array “模式匹配”,只要等号两边的模式相同,左边的变量就会被赋予对应的值: Exp 1: var [head, ...tail] = [1, 2, 3, 4]; console.log(head); console.log(tail); // [2, 3, 4] Exp 2: var [foo, [[bar], baz]] = [1, [[2], 3]]; foo bar ba…

var provinceValues=["010","020","028","0755","023","852"]; var [BeiJing,GuangZhou,ChendDu,ShenZhen,ChongQing,HongKong]=provinceValues; console.log(HongKong);…