# Compare operations

Pulsar supports compare operations such as `<`,`>`,`==` and others but the syntax is a bit different than in other languages. Instead of operators, you use [functions](https://supernova-developers.gitbook.io/supernova-dsm/pulsar-language/functions):

```
{[ if @is.gt(var1, var2) ]}
  Executes when var1 > var2
{[/]}
```

The following compare functions are available:

### is.gt

`is.gt` results to true when argument 1 is greater than argument 2.

```
{[ if @is.gt(arg1, arg2) ]}
  Executes when arg1 > arg2
{[/]}
```

### is.lt

`is.gt` results to true when argument 1 is less than argument 2.

```
{[ if @is.lt(arg1, arg2) ]}
  Executes when arg1 < arg2
{[/]}
```

### is.nil

`is.nil` results to true when argument 1 is nil. Note that  value of`nil` is not the same as `not defined`! For example, retrieving detail about a specific screen that didn't exist produces nil, however not defining the variable is completely different

```
{[ if @is.nil(arg1) ]}
  Executes when arg1 is nil
{[/]}
```

### is.defined

`is.defined` results to true when argument 1 is undefined. Undefined variables were never defined in the current context (or in global context). Note that defined variables which are `nil` will result in `false`.

```
{[ if @is.defined(arg1) ]}
  Executes when arg1 was defined in current scope
{[/]}
```

### is.equals

`is.equals` results to true when both arguments are equal. Note that this means they have the same value (but don't necessarily have to have the same data type, such as `Double` and `Integer` defined number `1`).&#x20;

```
{[ if @is.equals(myNumber, 1) ]}
  Executes when myNumber == 1
{[/]}
```

### iif

Ternary function `iif` can be used to evaluate a boolean statement and then use one of two declared results:

```
{[ var myVariable @iif(@is.equals(textVariable, "Test"), 1, 2) ]}
```

In the example above, the statement (`@is.equals(textVariable, "Test")`) is evaluated. When `true`, `myVariable` is defined as `1`, while when resulting to `false`, `myVariable` is defined as `2`.


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