JavaScript------deconstructed Assignment

Source: Internet
Author: User

Deconstruction Assignment

Starting with ES6, JavaScript introduces an understanding of construct assignments, which can be assigned to a set of variables at the same time.

What is a deconstructed assignment? Let's take a look at the traditional way of assigning the elements of an array to several variables individually:

var array = [‘hello‘, ‘JavaScript‘, ‘ES6‘];var x = array[0];var y = array[1];var z = array[2];

Now, in ES6, you can assign values directly to multiple variables using a deconstructed assignment:

Note that when an array element is deconstructed and assigned, multiple variables are [...] enclosed.

If the array itself is nested, you can also use the following form to deconstruct the assignment, noting that the nesting level and position should be consistent:

let [x, [y, z]] = [‘hello‘, [‘JavaScript‘, ‘ES6‘]];x; // ‘hello‘y; // ‘JavaScript‘z; // ‘ES6‘

Deconstruction assignments can also omit certain elements:

let [, , z] = [‘hello‘, ‘JavaScript‘, ‘ES6‘]; // 忽略前两个元素,只对z赋值第三个元素z; // ‘ES6‘

If you need to remove several properties from an object, you can also use a deconstructed assignment to quickly get the specified properties of an object:

JavaScript------deconstructed Assignment

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