JavaScript Assignment
JavaScript Assignment Operators
Assignment operators assign values to JavaScript variables.
Operator
Example
Same As
=
x = y
x = y
+=
x += y
x = x + y
-=
x -= y
x = x - y
*=
x *= y
x = x * y
/=
x /= y
x = x / y
%=
x %= y
x = x % y
**=
x **= y
x = x ** y
Shift Assignment Operators
Operator
Example
Same As
<<=
x <<= y
x = x << y
>>=
x >>= y
x = x >> y
>>>=
x >>>= y
x = x >>> y
Bitwise Assignment Operators
Operator
Example
Same As
&=
x &= y
x = x & y
^=
x ^= y
x = x ^ y
|=
x |= y
x = x | y
Logical Assignment Operators
Operator
Example
Same As
&&=
x &&= y
x = x && (x = y)
||=
x ||= y
x = x || (x = y)
??=
x ??= y
x = x ?? (x = y)
Note
The Logical assignment operators are ES2020.
The = Operator
The Simple Assignment Operator assigns a value to a variable.
Simple Assignment Examples
let x = 10;
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let x = 10 + y;
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The += Operator
The Addition Assignment Operator adds a value to a variable.
Addition Assignment Examples
let x = 10;x += 5;
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let text = "Hello";
text += " World";
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The -= Operator
The Subtraction Assignment Operator subtracts a value from a variable.
Subtraction Assignment Example
let x = 10;
x -= 5;
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The *= Operator
The Multiplication Assignment Operator multiplies a variable.
Multiplication Assignment Example
let x = 10;x *= 5;
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The **= Operator
The Exponentiation Assignment Operator raises a variable to the power of the operand.
Exponentiation Assignment Example
let x = 10;
x **= 5;
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The /= Operator
The Division Assignment Operator divides a variable.
Division Assignment Example
let x = 10;x /= 5;
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The %= Operator
The Remainder Assignment Operator assigns a remainder to a variable.
Remainder Assignment Example
let x = 10;
x %= 5;
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The <<= Operator
The Left Shift Assignment Operator left shifts a variable.
Left Shift Assignment Example
let x = -100;
x <<= 5;
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The >>= Operator
The Right Shift Assignment Operator right shifts a variable (signed).
Right Shift Assignment Example
let x = -100;
x >>= 5;
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The >>>= Operator
The Unsigned Right Shift Assignment Operator right shifts a variable (unsigned).
Unsigned Right Shift Assignment Example
let x = -100;
x >>>= 5;
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The &= Operator
The Bitwise AND Assignment Operator does a bitwise AND operation on two operands
and assigns the result to the the variable.
Bitwise AND Assignment Example
let x = 10;
x &= 5;
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The |= Operator
The Bitwise OR Assignment Operator does a bitwise OR operation on two operands
and assigns the result to the variable.
Bitwise OR Assignment Example
let x = 10;
x |= 5;
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The ^= Operator
The Bitwise XOR Assignment Operator does a bitwise XOR operation on two operands
and assigns the result to the variable.
Bitwise XOR Assignment Example
let x = 10;
x ^= 5;
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The &&= Operator
The Logical AND assignment operator is used between two values.
If the first value is true, the second value is assigned.
Logical AND Assignment Example
let x = 10;
x &&= 5;
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The &&= operator is an ES2020 feature.
The ||= Operator
The Logical OR assignment operator is used between two values.
If the first value is false, the second value is assigned.
Logical OR Assignment Example
let x = 10;
x ||= 5;
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The ||= operator is an ES2020 feature.
The ??= Operator
The Nullish coalescing assignment operator is used between two values.
If the first value is undefined or null, the second value is assigned.
Nullish Coalescing Assignment Example
let x;
x ??= 5;
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The ??= operator is an ES2020 feature.
Test Yourself With Exercises
Exercise:
Use the correct assignment operator that will result in x being 15 (same as x = x + y).
x = 10;
y = 5;
x y;
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Start the Exercise
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Reference: https://www.w3schools.com/js/js_assignment.asp