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An operator performs some operation on single or multiple operands (data value) and produces a result. For example 1 + 2, where + sign is an operator and 1 is left operand and 2 is a right operand. The + operator adds two numeric values and produces a result which is 3 in this case.

**JavaScript includes following categories of operators.**

- Arithmetic Operators
- Comparison Operators
- Logical Operators
- Assignment Operators
- Conditional Operators

Arithmetic operators are used to perform mathematical operations. Below is some arithmetic operators with a short description.

Operator | Description |
---|---|

+ | Adds two numeric operands. |

- | Subtract right operand from left operand |

* | Multiply two numeric operands. |

/ | Divide left operand by right operand. |

% | Modulus operator. Returns remainder of two operands. |

++ | Increment operator. Increase operand value by one. |

-- | Decrement operator. Decrease value by one. |

```
var x = 6, y = 12, z = 15;
x + y; //returns 18
y - x; //returns 6
x * y; //returns 72
y / x; //returns 2
x % 2; //returns 0
x++; //returns 7
x--; //returns 5
```

JavaScript language includes operators that compare two operands and return the Boolean value true or false.

Operators | Description |
---|---|

== | Compares the equality of two operands without considering type. |

=== | Compares equality of two operands with type. |

!= | Compares inequality of two operands. |

> | Checks whether left side value is greater than right side value. If yes then returns true otherwise false. |

< | Checks whether left operand is less than right operand. If yes then returns true otherwise false. |

>= | Checks whether left operand is greater than or equal to right operand. If yes then returns true otherwise false. |

<= | Checks whether left operand is less than or equal to right operand. If yes then returns true otherwise false. |

```
var a = 6, b = 12, c = "6";
var x = a;
a == c; // returns true
a === c; // returns false
a == x; // returns true
a != b; // returns true
a > b; // returns false
a < b; // returns true
a >= b; // returns false
a <= b; // returns true
a >= c; // returns true
a <= c; // returns true
```

Logical operators are used to combine two or more conditions. JavaScript includes following logical operators.

Operator | Description |
---|---|

&& | && is known as AND operator. It checks whether two operands are non-zero (0, false, undefined, null or "" are considered as zero), if yes then returns 1 otherwise 0. |

|| | || is known as OR operator. It checks whether any one of the two operands is non-zero (0, false, undefined, null or "" is considered as zero). |

! | ! is known as NOT operator. It reverses the boolean result of the operand (or condition) |

```
var a = 5, b = 10;
(a != b) && (a < b); // returns true
(a > b) || (a == b); // returns false
(a < b) || (a == b); // returns true
!(a < b); // returns false
!(a > b); // returns true
```

JavaScript includes assignment operators to assign values to variables with fewer keystrokes.

Assignment operators | Description |
---|---|

= | Assigns right operand value to left operand. |

+= | Sums up left and right operand values and assign the result to the left operand. |

-= | Subtract right operand value from left operand value and assign the result to the left operand. |

*= | Multiply left and right operand values and assign the result to the left operand. |

/= | Divide left operand value by right operand value and assign the result to the left operand. |

%= | Get the modulus of left operand divide by right operand and assign resulted modulus to the left operand. |

```
var x = 5, y = 10;
x = y; //x would be 10
x += 1; //x would be 11
x -= 1; //x would be 10
x *= 5; //x would be 50
x /= 5; //x would be 10
x %= 2; //x would be 0
```

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