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JavaScript | Assignment operators

  • Last Updated : 02 Jun, 2020

The Assignment operator is  equal (=) which assigns the value of right-hand operand to its left-hand operand. That is if a = b assigns the value of b to a.

The simple assignment operator is used to assigning a value to a variable. The assignment operation evaluates to the assigned value. Chaining the assignment operator is possible in order to assign a single value to multiple variables. See the example.

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Syntax:

data=value

Examples:



// Lets take some variables
x=10
y=20

x=y // Here, x is equal to 20
y=x // Here, y is equal to 10

There are so many assignment operator as shown in the table with the description:th

NAMESHORTHAND OPERATORMEANING
Addition Assignment

a+=b

a=a+b

Subtraction Assignment

a-=b

a=a-b

Multiplication Assignment

a*=b

a=a*b

Division Assignment

a/=b



a=a/b

Remainder Assignment

a%=b

a=a%b

Exponentiation Assignment

a**=b

a=a**b

Left Shift Assignment

a<<=b

a=a<<b

Right Shift Assignment

a>>=b

a=a>>b

Bitwise AND Assignment

a&=b



a=a&b

Bitwise OR Assignment

a|=b

a=a | b

Bitwise XOR Assignment

a^=b

a=a^b

Addition Assignment: This operator adds the value to the right operand to a variable and assigns the result to the variable. The types of the two operands determine the behavior of the addition assignment operator. Addition or concatenation is possible. In case if concatenation then we use the string as an operand.

Example:

Javascript




<script>
 let a = 2;
 const b= 3;
  
 // Expected output: 2
 document.write(a);
  
 document.write('</br>');
   
 // Expected output: 4
 document.write(a = b + 1);
</script>

Output:

2
4

Subtraction Assignment:  This operator subtracts the value of the right operand from a variable and assigns the result to the variable.

Example:



Javascript




<script>
  
 let yoo=4;
  
 document.write(foo=yoo-1); // 4-1
  
</script>

Output:

3

Multiplication Assignment: This operator multiplies a variable by the value of the right operand and assigns the result to the variable.

Example:

Javascript




<script>
  
 let yoo=5;
  
 document.write(yoo=yoo*2); // 5*2
  
</script>

Output:

10

Division Assignment: This operator divides a variable by the value of the right operand and assigns the result to the variable.

Example:

Javascript




<script>
  
   let yoo=10;
   const moo=2;
  
   document.write(yoo=yoo/moo); // 10/2
  
   document.write("</br>");
  
   document.write(yoo/=0); // Infinity
  
</script>

Output:

5
Infinity

Remainder Assignment: This operator divides a variable by the value of the right operand and assigns the remainder to the variable.

Example:

Javascript




<script>
  
 let yoo=50;
  
 document.write(yoo%=10); //zero
  
</script>

Output:



0

Exponentiation Assignment: This operator raises the value of a variable to the power of the right operand.

Example:

Javascript




<script>
  
   let yoo=2;
   const moo=2;
  
   // 2 raise to the power 2
   document.write(yoo**moo);
  
</script>

Output:

4

Left Shift Assignment: This operator moves the specified amount of bits to the left and assigns the result to the variable.

Example:

Javascript




<script>
 var yoo=5; // 101
  
 // 20(In Binary 10100)
 document.write(yoo<<=2);
</script>

Output:

20

Right Shift Assignment: This operator moves the specified amount of bits to the right and assigns the result to the variable.

Example:

Javascript




<script>
 var yoo=5;
  
 document.write(yoo>>=2); // 001
  
</script>

Output:

1

Binary AND Assignment: This operator uses the binary representation of both operands, does a bitwise AND operation on them, and assigns the result to the variable.



Example:

Javascript




<script>
 var yoo=5;
  
 document.write(yoo&=2); // 000
  
</script>

Output:

0

Binary OR Assignment: This operator uses the binary representation of both operands, does a bitwise OR operation on them, and assigns the result to the variable.

Example:

Javascript




<script>
 var yoo=5;
  
 // 7(In binary: 111)
 document.write(yoo|=2);
  
</script>

Output:

7

 This operator uses the binary representation of both operands, does a bitwise XOR operation on them, and assigns the result to the variable.

Example:

Javascript




<script>
 var yoo=5;
  
 document.write(yoo^=2); // 111
  
</script>

Output:

7




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