Increment (++)

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

Syntax

Operator: x++ or ++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 (ECMA-262)
The definition of 'Increment operator' in that specification.

Browser compatibility

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See also