What is the difference between x-- and --x

The difference between x-- and --x: 1. [--x] decrements the value of x by 1 first, and then calculates the value of x; 2. [x--] calculates x first value, and then decrement the value of x by 1.

##The difference between x-- and --x:

• - -x means that the value of x is decremented by 1 first, and then the value of x is calculated.

• x-- is to first calculate the value of x, and then decrement the value of x by 1.

var x = 10;
console.log(x--);
console.log(x);

10
9

var x = 10;
console.log(--x);
console.log(x);

9
9

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