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* Added JavaScript syntax, corrected sentence. Corrected / Added: The other assignment operators "are usually" shorthand "methods" for performing "standard" operations using the variable (indicated by x above) and value (indicated by y above) and then assigning the result to the variable itself. Added: JavaScript syntax to "Examples" and "Variations" . Corrected: The operator table title by adding an "A" and a capital S to JavaScript. * fix: escaped bitwise OR operator
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title
| title |
|---|
| Assignment Operators |
Assignment Operators
Assignment operators, as the name suggests, assign (or re-assign) values to a variable. While there are quite a few variations of assignment operators, they all build off of the basic assignment operator.
Syntax
x = y; |
Description | Necessity |
|---|---|---|
x |
Variable | Required |
= |
Assignment operator | Required |
y |
Value to assign to variable | Required |
Examples
let initialVar = 5; // Variable initialization requires the use of an assignment operator
let newVar = 5;
newVar = 6; // Variable values can be modified using an assignment operator
Variations
The other assignment operators are usually shorthand methods for performing standard operations using the variable (indicated by x above) and value (indicated by y above) and then assigning the result to the variable itself.
For example, below is the syntax for the addition assignment operator:
x += y;
This is the same as applying the addition operator and reassigning the sum to the original variable (i.e., x), which can be expressed by the following code:
x = x + y;
To illustrate this using actual values, here is another example of using the addition assignment operator:
let myVar = 5; // value of myVar: 5
myVar += 7; // value of myVar: 5 + 7 = 12
A complete list of JavaScript's assignment operators
| Operator | Syntax | Long version |
|---|---|---|
| Assignment | x = y | x = y |
| Addition assignment | x += y | x = x + y |
| Subtraction assignment | x -= y | x = x - y |
| Multiplication assignment | x *= y | x = x * y |
| Division assignment | x /= y | x = x / y |
| Remainder assignment | x %= y | x = x % y |
| Exponentiation assignment | x **= y | x = x ** y |
| Left shift assignment | x <<= y | x = x << y |
| Right shift assignment | x >>= y | x = x >> y |
| Unsigned right shift assignment | x >>>= y | x = x >>> y |
| Bitwise AND assignment | x &= y | x = x & y |
| Bitwise XOR assignment | x ^= y | x = x ^ y |
| Bitwise OR assignment | x |= y | x = x | y |