Increment (++)

The increment operator (++) increments (adds one to) its operand and returns a value.

Syntax

x++
++x

Description

If used postfix, with operator after operand (for example, x++), the increment operator increments and returns the value before incrementing.

If used prefix, with operator before operand (for example, ++x), the increment operator increments and returns the value after incrementing.

Examples

Postfix increment

let x = 3;
y = x++;

// y = 3
// x = 4

Prefix increment

let a = 2;
b = ++a;

// a = 3
// b = 3

Specifications

Specification
ECMAScript Language Specification
# sec-postfix-increment-operator

Browser compatibility

BCD tables only load in the browser

See also