> For the complete documentation index, see [llms.txt](https://motivlabs.gitbook.io/impulse-user-manual/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://motivlabs.gitbook.io/impulse-user-manual/content-manipulators-motators/liquid-field/basics/operators.md).

# Operators

## Operators

Liquid includes many logical and comparison operators. You can use operators to create logic with [control flow](/impulse-user-manual/content-manipulators-motators/liquid-field/tags/control-flow.md) tags.

### Basic operators <a href="#basic-operators" id="basic-operators"></a>

| `==`  | equals                   |
| ----- | ------------------------ |
| `!=`  | does not equal           |
| `>`   | greater than             |
| `<`   | less than                |
| `>=`  | greater than or equal to |
| `<=`  | less than or equal to    |
| `or`  | logical or               |
| `and` | logical and              |

For example:

```
{% if product.title == "Awesome Shoes" %}
  These shoes are awesome!
{% endif %}
```

You can do multiple comparisons in a tag using the `and` and `or` operators:

```
{% if product.type == "Shirt" or product.type == "Shoes" %}
  This is a shirt or a pair of shoes.
{% endif %}
```

### contains <a href="#contains" id="contains"></a>

`contains` checks for the presence of a substring inside a string.

```
{% if product.title contains "Pack" %}
  This product's title contains the word Pack.
{% endif %}
```

`contains` can also check for the presence of a string in an array of strings.

```
{% if product.tags contains "Hello" %}
  This product has been tagged with "Hello".
{% endif %}
```

`contains` can only search strings. You cannot use it to check for an object in an array of objects.

### Order of operations <a href="#order-of-operations" id="order-of-operations"></a>

In tags with more than one `and` or `or` operator, operators are checked in order *from right to left*. You cannot change the order of operations using parentheses — parentheses are invalid characters in Liquid and will prevent your tags from working.

```
{% if true or false and false %}
  This evaluates to true, since the `and` condition is checked first.
{% endif %}
```

```
{% if true and false and false or true %}
  This evaluates to false, since the tags are checked like this:

  true and (false and (false or true))
  true and (false and true)
  true and false
  false
{% endif %}
```


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