### (Using order of operations in JavaScript)

When writing arithmetic in JavaScript, operator precedence dictates the order in which operations are performed.

**(Example) **

`var x = 10 + 5 * 2;`

In the above example, what is the value of x?

Luckily, JavaScript uses the same operational order as traditional mathematics, which tells us that x = 20.

**(Example)**

`var x = (10 + 5) * 2;`

When using parentheses, the operations inside are calculated first. In the above example, x = 30.

**(Example)**

```
var x = 10 + 5 - 2;
```

When operations have the same precedence (like addition and subtraction), they are calculated from left to right:

In the above example, x = 13.

Here is a basic list of operator precedence in JavaScript

Order | Operator | Description | Example |
---|---|---|---|

1 | ( ) | Expression grouping | (10 + 5) |

2 | * | Multiplication | 10 * 5 |

2 | / | Division | 10 / 5 |

2 | ** | Exponentiation | 10 ** 5 |

3 | + | Addition | 10+5 |

3 | - | Subtraction | 10-5 |

For a more complete list, you can checkout this article on w3schools.com:

http://www.w3schools.com/js/js_arithmetic.asp