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…
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…
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…
[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…
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…
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…
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,…
前面提到 ES5 对象属性描述符,这篇看看对象的扩展.密封和冻结. 扩展对象 Object.preventExtensions Object.isExtensible 密封对象 Object.seal Object.isSealed 冻结对象 Object.freeze Object.isFrozen 1. Object.preventExtensions 阻止对象扩展,让一个对象变的不可扩展,也就是永远不能再添加新的属性 ES3 是没有办法阻止对象扩展的,定义对象后可以给对象添加任意属性,如…
Intent传递基本类型相信大家都十分熟悉,如何传递Object对象或者ArrayList<Object>对象呢? 可以通过: (1)public Intent putExtra (String name, Serializable value) (2)public Intent putExtra (String name, Parcelable value) public Intent putParcelableArrayListExtra(String name, ArrayList<…
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…