2 functionmyFunc(x, y, ...params) {// used rest operator hereconsole.log(x);console.log(y);console.log(params); }varinputs = ["a","b","c","d","e","f"];myFunc(...inputs);// used spread operator here// "a"// "b"//
摘要:Three dots ( … ) in JavaScript。 本文分享自华为云社区《JavaScript 里三个点 ... 的用法》,作者: Jerry Wang 。 Rest Parameters 使用rest 参数,我们可以将任意数量的参数收集到一个数组中,然后用它们做我们想做的事情。 引入了其余参数以减少由参数引起的样板代码。 function myFunc(a, b, ...args...
myFunc(1, 2, 3, 4) // 6 (fourth parameter is not destructured) 1. 2. 3. 4. 5. 6. Spread Operators 展开运算符用于将可迭代对象(如数组)的元素扩展到可以容纳多个元素的位置。 function myFunc(x, y, ...params) { // used rest operator here console.log(x); console.log(y); console....
functionmyFunc(x, y, ...params) {// used rest operator hereconsole.log(x);console.log(y);c...
Three dots ( … ) in JavaScript Rest Parameters 使用rest 参数,我们可以将任意数量的参数收集到一个数组中,然后用它们做我们想做的事情。 引入了其余参数以减少由参数引起的样板代码。 functionmyFunc(a,b,...args){console.log(a);// 22console.log(b);// 98console.log(args);// [43, 3, 26]};...
What does it look like?Three dots: ... What does it do?The spread operator allows an expression to be expanded in places where multiple elements/variables/arguments are expected. Boring stuff out of the way, let’s look at a bunch of examples to better understand what in the heck the ...
Learn how to unleash the power of the spread operator in JavaScript. The easy-to-follow guide shows you just how todo that.
let person = { // The "name" property is another object // “name”属性是另一个对象 name: { first: "Joe", last: "Bloggs" }, age: 30 }; // Access the first name with dots // 用点访问 first name console.log(person.name.first); // Joe // Access the first name with strings...
Here’s how to use the spread operator to efficiently add elements to the beginning of an array in the web development process. const oldArray = [3, 5, 7]; const newElements = [1, 2]; // Efficiently combine new elements and old array using spread operator const newArray = [...new...
The Spread syntax is simply three dots(...)preappended to the name of the iterable you want to spread. You can use the Spread operator to expand JavaScript iterables such as objects, arrays and even strings in places where they are expected. For example, in function arguments, as arrays ...