Package com.singularsys.jep.misc.dictionary

Class Keys

java.lang.Object

com.singularsys.jep.functions.PostfixMathCommand

com.singularsys.jep.functions.UnaryFunction

com.singularsys.jep.misc.dictionary.Keys

All Implemented Interfaces:

PostfixMathCommandI, Serializable

Direct Known Subclasses:

MatrixDictKeys

public class Keys
extends UnaryFunction

Return the keys of a map a nested list of key-value pairs. Evaluating

map = {'x':2, 'y':3};
keys(map);

gives ['x', 'y'] , order is not guaranteed. Returns a Vector<Object>.

Since:

Jep 4.1

See Also:

• Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class com.singularsys.jep.functions.UnaryFunction

UnaryFunction.FunctionWithException<T>

Field Summary

Fields inherited from class com.singularsys.jep.functions.PostfixMathCommand

curNumberOfParameters, description, name, NaN, numberOfParameters

Constructor Summary

Constructors

Constructor	Description
Keys()

Method Summary

Modifier and Type	Method	Description
Object	eval(Object l)	Evaluate the function
protected Object	eval(List<?> list)
protected Object	eval(Map<Object,Object> map)

Methods inherited from class com.singularsys.jep.functions.UnaryFunction

instanceOf, instanceOf, instanceOf, instanceOf, run

Methods inherited from class com.singularsys.jep.functions.PostfixMathCommand

asArray, asBool, asDouble, asInt, asLong, asStrictInt, asString, asType, checkNumberOfParameters, getDescription, getDescription, getDescriptionWithType, getName, getNumberOfParameters, setCurNumberOfParameters, setDescription, setName, toString, toString

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

Keys

public Keys()

Method Details

eval

public Object eval(Object l)
            throws EvaluationException

Description copied from class: UnaryFunction

Evaluate the function

Specified by:

eval in class UnaryFunction

Parameters:

l - the single argument passed in

Returns:

the result of the function

Throws:

EvaluationException - on error

eval

protected Object eval(Map<Object,Object> map)
               throws EvaluationException

Throws:

EvaluationException

eval

protected Object eval(List<?> list)
               throws EvaluationException

Throws:

EvaluationException