Mid (Jep with extensions API )

java.lang.Object
- com.singularsys.jep.functions.PostfixMathCommand
- - com.singularsys.jep.functions.NaryFunction
  - - com.singularsys.jep.functions.strings.Mid

All Implemented Interfaces:

PostfixMathCommandI, java.io.Serializable
```
public class Mid
extends NaryFunction
```
Extract substring of first argument: mid("abcdefg",2,3) -> "cde" Syntax: mid(str,start,len) Second argument is starting index, with the first character being at index 0. Third argument is number of characters to return. Note this differs from Excel's mid function which has 1 as the index of the first character.
- If start is greater than the length of the string an EvaluationException is thrown.
- If start is less than zero an EvaluationException is thrown.
- If len is less than zero an EvaluationException is thrown.
- If start+len is greater than the length of the string return all characters from start.
- If str is not a string an EvaluationException is thrown.
- If start is not a number representing an integer an EvaluationException is thrown.
- If end is not a number representing an integer an EvaluationException is thrown.
See Also:

String.substring(int, int), Serialized Form

- Field Summary
  - Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand
    curNumberOfParameters, name, NaN, numberOfParameters
- Constructor Summary
  
  Constructors
  Constructor Description
  
  Mid()
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  java.lang.Object eval(java.lang.Object[] args)
  Evaluate the function
  - Methods inherited from class com.singularsys.jep.functions.NaryFunction
    run
  - Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand
    asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, checkNumberOfParameters, getName, getNumberOfParameters, setCurNumberOfParameters, setName, toString, toString
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Mid
```
public Mid()
```
- Method Detail
  - eval
```
public java.lang.Object eval(java.lang.Object[] args)
                      throws EvaluationException
```
    Description copied from class: NaryFunction
    
    Evaluate the function
    
    Specified by:
    
    eval in class NaryFunction
    
    Parameters:
    
    args - arguments to the function
    
    Returns:
    
    value returned by the function
    
    Throws:
    
    EvaluationException - if the calculation cannot be performed