The difference between ++i and i++ in js

The increment operator i in JavaScript first increments the variable value and then returns the incremented value, while i first returns the variable value and then increments it. Usage scenarios: If you need to use the variable value before incrementing, use i; if you need to use the variable value after incrementing, use i.

The difference between i and i in JavaScript

In JavaScript, i and i are two increment operators, used to increase the value of variable i by 1. The main difference is the timing of the increment operation.

i (prefix increment)

• First increment the value of variable i.
• Then return the incremented value.

Example:

let i = 0;
console.log(++i); // 输出：1

i (suffix increasing)

• First returns the current value of variable i.
• Then increment the value of i.

Example:

let i = 0;
console.log(i++); // 输出：0
console.log(i);    // 输出：1

Summary

Before increment The value after incrementAfter incrementThe original value before increment

Operator	Time to perform increment operation	Return value
## i
i

Usage scenarios

Use # when you want to use the value of
• i before incrementing it ##i. Use
i
• when you want to use its value after incrementing i.

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