Decrement (--)
The decrement operator (--
) decrements (subtracts one from) its operand and returns a value.
Syntax
Operator: x-- or --x
Description
If used postfix, with operator after operand (for example, x--
), the decrement operator decrements and returns the value before decrementing.
If used prefix, with operator before operand (for example, --x
), the decrement operator decrements and returns the value after decrementing.
Examples
Postfix decrement
let x = 3;
y = x--;
// y = 3
// x = 2
Prefix decrement
let a = 2;
b = --a;
// a = 1
// b = 1