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…

Not only can you provide default values when using ES6 parameter object destructuring, but you can also require the presence of certain properties. function ajax({ type = "get", url = requiredParameter("url"), data = {}, success = requ…

Creating Object: Example 1: let name = "Brook"; let totalReplies = 249; let avatar = "/users/avatars/brook-user-1.jpg"; let user = {name, totalReplies, avatar}; addUserToSidebar(user); Example 2: function buildMetadata(object){ let id…

解构声明的概念和作用 把一个对象成员解构(destructure)成多个变量,称为解构声明(destructuring declaration). component1(),component2()等函数是Kotlin约定的操作符,componentN是操作符(类似加减乘除的运算符),重载操作符必须要用operator修饰以允许使用 class MyPair<K, V>(val first: K, val second: V) { operator fun component1(): K {…

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…

接着上一篇的说. arrow functions 箭头函数 => 更便捷的函数声明 document.getElementById("click_1").onclick = function(){ console.log("say Hi!"); } document.getElementById("click_2").onclick = () => { let a = 1; let b = 2; console.log(a + b);…

[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…

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…

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…