functionmyFunc(...[x, y, z]) { return x * y* z; }myFunc(1)// NaNmyFunc(1,2,3)// 6myFunc(1,2,3,4)// 6 (fourth parameter is not destructured) 2 functionmyFunc(x, y, ...params) {// used rest operator hereconsole.log(x);console.log(y);console.log(params); }varinputs...
In this article, we are going to discuss a feature introduced in ES6 that is spread operator and rest operator. 🔥 🔥 🔥 I've become a big fan of the three dots that may change your style of solving the problem within JavaScript. We can use three dots … in two different ways a...
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.log(params); } var inputs = ["a", "b", "c", "d", "e", "f"]; myFunc(...inputs); // used sp...
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。 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"// ...
functionmyFunc(x, y, ...params) {// used rest operator hereconsole.log(x);console.log(y);...
The JavaScript spread operator () allows us to spread out elements of an iterable such as an array. The spread operator is represented with three dots (). This is operator is introduced in ES6. The main use cases of the spread operator are to copy array elements, concatenate arrays or ...
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 ...
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To obtain the value of a property, use the dot (.) or square bracket ([]) operators described in §4.4. The lefthand side should be an expression whose value is an object. If using the dot operator, the righthand side must be a simple identifier that names the property. If using sq...
Three Dots Rest Operator 在JavaScript 函数调用时我们往往会使用内置的 arguments 对象来获取函数的调用参数,不过这种方式却存在着很多的不方便性。譬如 arguments 对象是 Array-Like 对象,无法直接运用数组的 .map() 或者 .forEach() 函数;并且因为 arguments 是绑定于当前函数作用域,如果我们希望在嵌套函数里使用外...