63 lines
2.5 KiB
Markdown
63 lines
2.5 KiB
Markdown
---
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title: Assignment Operators
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---
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# Assignment Operators
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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.
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## Syntax
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`x = y;`| Description | Necessity
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:---------:|:---------------------:|:---------:
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`x` | Variable | Required
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`=` | Assignment operator | Required
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`y` | Value to assign to variable | Required
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## Examples
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```javascript
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let initialVar = 5; // Variable initialization requires the use of an assignment operator
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let newVar = 5;
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newVar = 6; // Variable values can be modified using an assignment operator
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```
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## Variations
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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.
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For example, below is the syntax for the addition assignment operator:
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```javascript
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x += y;
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```
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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:
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```javascript
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x = x + y;
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```
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To illustrate this using actual values, here is another example of using the addition assignment operator:
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```javascript
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let myVar = 5; // value of myVar: 5
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myVar += 7; // value of myVar: 5 + 7 = 12
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```
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## A complete list of JavaScript's assignment operators
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Operator | Syntax | Long version
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------------------------------- | --------- | -------------
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Assignment | x = y | x = y
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Addition assignment | x += y | x = x + y
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Subtraction assignment | x -= y | x = x - y
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Multiplication assignment | x *= y | x = x * y
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Division assignment | x /= y | x = x / y
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Remainder assignment | x %= y | x = x % y
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Exponentiation assignment | x **= y | x = x ** y
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Left shift assignment | x <<= y | x = x << y
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Right shift assignment | x >>= y | x = x >> y
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Unsigned right shift assignment | x >>>= y | x = x >>> y
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Bitwise AND assignment | x &= y | x = x & y
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Bitwise XOR assignment | x ^= y | x = x ^ y
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Bitwise OR assignment | x \|= y | x = x \| y
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### More Information:
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<a href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators/Assignment_Operators#Assignment' target='_blank' rel='nofollow'>MDN link</a>
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<a href='https://docs.microsoft.com/en-us/scripting/javascript/reference/assignment-operator-decrement-equal-javascript' target='_blank' rel='nofollow'>MSDN link</a>
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