# Video outline

Operators are used to define a range, scope or limitation, just like a mathematical equation.
Control flow tags create conditions that decided whether blocks of code should be executed and they can be used to test or compare a result.

What operators can be used in liquid:

Name

Use

Symbol

Equal

Check if two values are the same

==

Difference

Check if two values are different

=!

Greater than

Check if the value on the left side is larger than the value on the right side

Greater than or equal

Check if the value on the left side is larger or equal than the value on the right side

=

Smaller than

Check if the value on the right side is larger than the value on the left side

<

Smaller than or equal

Check if the value on the right side is larger or equal than the value on the left side

<=

Or

Combine two or more of the above operators.

or

And

Combine two or more of the above operators

and

Contains

Check if a given string is part of a another string

contains

## Examples

In this example if blank is equal to or greater or the same or different than 10:

``````{% if  == 10 %}We are the same as 10{% endif %}
{% if  != 10 %}We are different from 10{% endif %}
{% if  > 10 %}greater than 10{% endif %}
{% if  <= 10 %}greater than or equal to 10{% endif %}
{% if  < 10 %}smaller than 10{% endif %}
{% if  <= 10 %}smaller than or equal to 10{% endif %}
``````

If the equation meets it will print out the text that’s following afterwards

In this second example we want to check if an input field is showing profitability or not.

``````{% if  input custom.pl.check default:1 %}

**Are we profitable?**

{% if  custom.pl.check > 0 %}Profitable
{% else %}Loss{% endif %}
``````

## Conclusion

• Operators are used to define a range, scope or limitation
• Operators are used to compare values. In combination with control flow tags you can put some logic in your coding

### 📘Equal than ==

Remember we use a double-equal sign to show that we’re checking a value, rather than setting it equal to something, like we would with a variable.