Assignment Operators

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JavaScript supports the following assignment operators −

Sr.No Operator and Description
1 = (Simple Assignment )

Assigns values from the right side operand to the left side operand

Ex: C = A + B will assign the value of A + B into C

2 += (Add and Assignment)

It adds the right operand to the left operand and assigns the result to the left operand.

Ex: C += A is equivalent to C = C + A

3 −= (Subtract and Assignment)

It subtracts the right operand from the left operand and assigns the result to the left operand.

Ex: C -= A is equivalent to C = C – A

4 *= (Multiply and Assignment)

It multiplies the right operand with the left operand and assigns the result to the left operand.

Ex: C *= A is equivalent to C = C * A

5 /= (Divide and Assignment)

It divides the left operand with the right operand and assigns the result to the left operand.

Ex: C /= A is equivalent to C = C / A

6 %= (Modules and Assignment)

It takes modulus using two operands and assigns the result to the left operand.

Ex: C %= A is equivalent to C = C % A

Note − Same logic applies to Bitwise operators so they will become like <<=, >>=, >>=, &=, |= and ^=.

Example

Try the following code to implement assignment operator in JavaScript.

<html>
   <body>
   
      <script type="text/javascript">
         <!--
            var a = 33;
            var b = 10;
            var linebreak = "<br />";
         
            document.write("Value of a => (a = b) => ");
            result = (a = b);
            document.write(result);
            document.write(linebreak);
         
            document.write("Value of a => (a += b) => ");
            result = (a += b);
            document.write(result);
            document.write(linebreak);
         
            document.write("Value of a => (a -= b) => ");
            result = (a -= b);
            document.write(result);
            document.write(linebreak);
         
            document.write("Value of a => (a *= b) => ");
            result = (a *= b);
            document.write(result);
            document.write(linebreak);
         
            document.write("Value of a => (a /= b) => ");
            result = (a /= b);
            document.write(result);
            document.write(linebreak);
         
            document.write("Value of a => (a %= b) => ");
            result = (a %= b);
            document.write(result);
            document.write(linebreak);
         //-->
      </script>
      
      <p>Set the variables to different values and different operators and then try...</p>
   </body>
</html>

Output

Value of a => (a = b) => 10
Value of a => (a += b) => 20 
Value of a => (a -= b) => 10 
Value of a => (a *= b) => 100 
Value of a => (a /= b) => 10
Value of a => (a %= b) => 0
Set the variables to different values and different operators and then try...
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