How to implement variable exchange in es6

Variable exchange method: 1. With the help of the third variable c, the syntax "c=a;a=b;b=c;", so that the values ​​of variables a and b can be interchanged; 2. Using arrays Subscript reassignment, the syntax is "a=[a,b];b=a[0];a=a[1];"; 3. Use the destructuring assignment of the array, the syntax is "[a, b]=[b, a];".

The operating environment of this tutorial: Windows 7 system, ECMAScript version 6, Dell G3 computer.

Method to implement variable exchange in es6

Method 1: With the help of the third variable

There are two variables a and b, and variable exchange can be achieved with the help of a third variable c.

• First assign the a value to c

• , then assign the b value to a

• Finally assign Assign the c value to b

var a=1;
var b=2;
var c=a;
a=b;
b=c;
console.log(a,b)//2,1

Method 2: Reassign the value using the array subscript

var a = 3,
    b = 4;
a = [a, b];
b = a[0];
a = a[1];
console.log(a,b)

Method 3: Use the destructuring assignment of the array to exchange the value of the variable

var a = 3,
    b = 4;
[a, b] = [b, a];
console.log(a,b)

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