JavaScript Code

Addition Assignment

+= symbol is used for addition assignment operator

addition assignment operator takes two operands, adds the value in right operand to that of the left operand, and assigns the result back to the left operand

a += 5  //equivalent to a = a + 5
a += b  //equivalent to a = a + b

Examples

1. addition assign a with 5

var a = 4;
a += 5;
console.log(a);

2. add a with value in b and assign the result back to a

var b = 7;
var a = 4;
a += b;
console.log(a);