FunctionDictionaryIfc (EvalEx 3.5.0 API)

All Known Implementing Classes:

MapBasedFunctionDictionary
```
public interface FunctionDictionaryIfc
```
A function dictionary holds all the functions, that can be used in an expression.
The default implementation is the MapBasedFunctionDictionary.

Method Summary

All Methods Instance Methods Abstract Methods Default Methods
Modifier and Type	Method	Description
`void`	`addFunction(java.lang.String functionName, FunctionIfc function)`	Allows to add a function to the dictionary.
`FunctionIfc`	`getFunction(java.lang.String functionName)`	Get the function definition for a function name.
`default boolean`	`hasFunction(java.lang.String functionName)`	Check if the dictionary has a function with that name.

- Method Detail
  - addFunction
```
void addFunction(java.lang.String functionName,
                 FunctionIfc function)
```
    Allows to add a function to the dictionary. Implementation is optional, if you have a fixed set of functions, this method can throw an exception.
    
    Parameters:
    
    functionName - The function name.
    
    function - The function implementation.
  - hasFunction
```
default boolean hasFunction(java.lang.String functionName)
```
    Check if the dictionary has a function with that name.
    
    Parameters:
    
    functionName - The function name to look for.
    
    Returns:
    
    true if a function was found or false if not.
  - getFunction
```
FunctionIfc getFunction(java.lang.String functionName)
```
    Get the function definition for a function name.
    
    Parameters:
    
    functionName - The name of the function.
    
    Returns:
    
    The function definition or null if no function was found.