JavaScript Code

Arithmetic Decrement

-- symbol is used for arithmetic decrement operator

arithmetic decrement operator takes a variable as operand, decrements the value in the variable by one

based on whether the decremented value is reflected in the variable during post executing the statement, or while executing the statement, there are two types of decrement operations: post-decrement, and pre-decrement.

a--  //post-decrement
--a  //pre-decrement 

Examples

1. decrement a

var a = 6;
a--;
console.log(a);

2. post-decrement a

var a = 6;
console.log(a--);
//6
console.log(a);
//5

3. pre-decrement a

var a = 6;
console.log(--a);
//5
console.log(a);
//5