# Comparison

One of the most useful functions of any coding language is the ability to compare two or more values and return whether or not they are equal. Almost every conditional statement you write will make use of these comparison operators.

## Comparison Operators

In JavaScript, data-type does not usually matter when comparing two values. Unless specifically stated otherwise, the values are converted to the same type at the time of comparison.

| Name                  | Operator | Description                                                              | Example                                                |
| --------------------- | -------- | ------------------------------------------------------------------------ | ------------------------------------------------------ |
| Equal                 | `==`     | returns `true` if the values are equal, regardless of data-type          | `3 == 3 //true`; `'3' == 3 //true`                     |
| Not Equal             | `!=`     | returns `true` if the values are not equal, regardless of data-type      | `3 != 4 //true`; `'3' != 3 //false`                    |
| Strict Equal          | `===`    | returns `true` ONLY if the values are equal AND the same data-type       | `3 === 3 //true`; `'3' === 3 //false`                  |
| Strict Not Equal      | `!==`    | returns `true` if the values are not equal OR not the same data-type     | `3 !== 4 //true`; `'3' !== 3 //true`                   |
| Greater than          | `>`      | returns `true` if value A is larger than value B                         | `4 > 3 //true`; `3 > 4 //false`                        |
| Greater than or equal | `>=`     | returns `true` if value A is larger or the same as value B               | `4 >= 3 //true`; `4 >= 4 //true`; `3 >= 4 //false`     |
| Less than             | `<`      | returns `true` if value A is smaller than value B                        | `3 < 4 //true`; `4 < 3 //false`                        |
| Less than or equal    | `<=`     | returns `true` if value A is smaller or the same as value B              | `3 <= 4 //true`; `3 <= 3 //true`; `4 <= 3 //false`     |
| AND                   | `&&`     | returns `true` ONLY if value/condition A AND value/condition B are true  | `true && true //true`; `true && false //false`         |
| OR                    | \|\|     | returns `true` if EITHER value/condition A OR value/condition B are true | `true`\|\| `false //true`; `false`\|\| `false //false` |

## File Location

We will be working in the following file:

```
    javascript-library
        └── 0-PreWork
        └── 1-Fundamentals
            └── 1-Grammar-and-Types
            └── 2-ControlFlow-and-ErrorHandling
            └── 3-Loops
            └── 4-Functions
            └── 5-Expressions-and-Operators
                01-assignment.js 
                02-comparison.js <----You will be working in this file.
```

## Practice

1. In `comparison.js`, create a variable and assign it a value.
2. Use the comparison operators to compare the variable to other values and print the results.
3. Use conditional statements and comparison operators to create a program with the following results:

*If a person's age is over 25, they can rent a car. If a person's age is over 21, but less than 25, they can have a beer. If a person's age is over 18, but less than 21, they can vote. If a person's age is less than 18, make fun of them for being a child.*