# ParameterExists()

Determines if the parameter exists

```
ParameterExists( parameter=variableString );
```

**Returns:** boolean

# Arguments

| Argument | Type | Required | Description | Default |
|----------|------|----------|-------------|---------|
| parameter | variableString | Yes | Name of the string variable to test for. *Alias: param* |  |

# Examples

```cfml
  bool = true;
	string = "I'm a string";
	numeric = 100;

	boolean_exists = ParameterExists("bool");
	string_exists = ParameterExists("string");
	number_exists = ParameterExists("number");

	dump(boolean_exists); //true
	dump(string_exists); //true
	dump(number_exists); //false
```





