Package com.github.basking2.sdsai.itrex.functions.functional

Class FoldLeftFunction

java.lang.Object

com.github.basking2.sdsai.itrex.functions.AbstractFunction2<FunctionInterface<Object>,Object,Object>

com.github.basking2.sdsai.itrex.functions.functional.FoldLeftFunction

All Implemented Interfaces:

FunctionInterface<Object>, BiFunction<Iterator<?>,EvaluationContext,Object>

public class FoldLeftFunction
extends AbstractFunction2<FunctionInterface<Object>,Object,Object>

Fold a given value over all elements.

     
     [* Assume the add function exists. *]

     [foldLeft [curry add] 0 [1,2,3,4]]

     
 

This is much like the foldLeft function common in Scala or ML languages. There is no foldRight as iterators make it expensive to materialize to a list and then foldRight. If such an algorithm is necessary, operate on the list in a reversed projection.

Constructor Summary

Constructors

Constructor	Description
FoldLeftFunction()

Method Summary

Modifier and Type	Method	Description
protected Object	applyImpl(FunctionInterface<Object> objectFunctionInterface, Object o, Iterator<?> rest, EvaluationContext context)	Overriders of this class should implement this.

Methods inherited from class com.github.basking2.sdsai.itrex.functions.AbstractFunction2

apply

Methods inherited from class java.lang.Object

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

Methods inherited from interface java.util.function.BiFunction

andThen

Constructor Details

FoldLeftFunction

public FoldLeftFunction()

Method Details

applyImpl

protected Object applyImpl(FunctionInterface<Object> objectFunctionInterface,
 Object o,
 Iterator<?> rest,
 EvaluationContext context)

Description copied from class: AbstractFunction2

Overriders of this class should implement this.

Specified by:

applyImpl in class AbstractFunction2<FunctionInterface<Object>,Object,Object>

Parameters:

objectFunctionInterface - The desired parameter.

o - The desired parameter.

rest - Any unused arguments.

context - The evaluation context.

Returns:

The produced object.