Package com.jnape.palatable.lambda.functions.builtin.fn3

Class CmpEqBy<A,B extends Comparable<B>>

java.lang.Object

com.jnape.palatable.lambda.functions.builtin.fn3.CmpEqBy<A,B>

Type Parameters:

A - the value type

B - the mapped comparison type

All Implemented Interfaces:

Fn1<Fn1<? super A,? extends B>,Fn1<A,Fn1<A,Boolean>>>, Fn2<Fn1<? super A,? extends B>,A,Fn1<A,Boolean>>, Fn3<Fn1<? super A,? extends B>,A,A,Boolean>, Applicative<Fn1<A,Fn1<A,Boolean>>,Fn1<Fn1<? super A,? extends B>,?>>, Cartesian<Fn1<? super A,? extends B>,Fn1<A,Fn1<A,Boolean>>,Fn1<?,?>>, Cocartesian<Fn1<? super A,? extends B>,Fn1<A,Fn1<A,Boolean>>,Fn1<?,?>>, Contravariant<Fn1<? super A,? extends B>,Profunctor<?,Fn1<A,Fn1<A,Boolean>>,Fn1<?,?>>>, Functor<Fn1<A,Fn1<A,Boolean>>,Fn1<Fn1<? super A,? extends B>,?>>, Profunctor<Fn1<? super A,? extends B>,Fn1<A,Fn1<A,Boolean>>,Fn1<?,?>>, Monad<Fn1<A,Fn1<A,Boolean>>,Fn1<Fn1<? super A,? extends B>,?>>, MonadReader<Fn1<? super A,? extends B>,Fn1<A,Fn1<A,Boolean>>,Fn1<Fn1<? super A,? extends B>,?>>, MonadRec<Fn1<A,Fn1<A,Boolean>>,Fn1<Fn1<? super A,? extends B>,?>>, MonadWriter<Fn1<? super A,? extends B>,Fn1<A,Fn1<A,Boolean>>,Fn1<Fn1<? super A,? extends B>,?>>

public final class CmpEqBy<A,B extends Comparable<B>>
extends Object
implements Fn3<Fn1<? super A,? extends B>,A,A,Boolean>

Given a mapping function from some type A to some Comparable type B and two values of type A, return true if the first value is strictly equal to the second value (according to Comparable.compareTo(Object) in terms of their mapped B results; otherwise, return false.

See Also:

• CmpEq
• CmpEqWith
• LTBy
• GTBy

Field Summary

Fields

Modifier and Type	Field	Description
private static final CmpEqBy<?,?>	INSTANCE

Constructor Summary

Constructors

Modifier	Constructor	Description
private	CmpEqBy()

Method Summary

Modifier and Type	Method	Description
BiPredicate<A,A>	apply(Fn1<? super A,? extends B> compareFn)	Partially apply this function by taking its first argument.
Predicate<A>	apply(Fn1<? super A,? extends B> compareFn, A x)	Partially apply this function by taking its first two arguments.
Boolean	checkedApply(Fn1<? super A,? extends B> compareFn, A x, A y)
static <A, B extends Comparable<B>> CmpEqBy<A,B>	cmpEqBy()
static <A, B extends Comparable<B>> BiPredicate<A,A>	cmpEqBy(Fn1<? super A,? extends B> compareFn)
static <A, B extends Comparable<B>> Predicate<A>	cmpEqBy(Fn1<? super A,? extends B> compareFn, A x)
static <A, B extends Comparable<B>> Boolean	cmpEqBy(Fn1<? super A,? extends B> compareFn, A x, A y)

Methods inherited from class java.lang.Object

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

Methods inherited from interface com.jnape.palatable.lambda.functions.Fn1

andThen, carry, cartesian, censor, choose, cocartesian, diMap, diMapR, discardL, flatMap, fmap, lazyZip, listens, local, pure, self, thunk, toFunction, trampolineM, zip, zip

Methods inherited from interface com.jnape.palatable.lambda.functions.Fn2

checkedApply, toBiFunction

Methods inherited from interface com.jnape.palatable.lambda.functions.Fn3

apply, checkedApply, compose, contraMap, diMapL, discardR, flip, uncurry, widen

Methods inherited from interface com.jnape.palatable.lambda.functor.Functor

coerce

Field Details

INSTANCE

private static final CmpEqBy<?,?> INSTANCE

Constructor Details

CmpEqBy

private CmpEqBy()

Method Details

checkedApply

public Boolean checkedApply(Fn1<? super A,? extends B> compareFn,
 A x,
 A y)

Specified by:

checkedApply in interface Fn3<Fn1<? super A,? extends B extends Comparable<B>>,A,A,Boolean>

apply

public BiPredicate<A,A> apply(Fn1<? super A,? extends B> compareFn)

Description copied from interface: Fn3

Partially apply this function by taking its first argument.

Specified by:

apply in interface Fn1<A,B extends Comparable<B>>

Specified by:

apply in interface Fn2<Fn1<? super A,? extends B extends Comparable<B>>,A,Fn1<A,Boolean>>

Specified by:

apply in interface Fn3<Fn1<? super A,? extends B extends Comparable<B>>,A,A,Boolean>

Parameters:

compareFn - the first argument

Returns:

an Fn2<B, C, D>

apply

public Predicate<A> apply(Fn1<? super A,? extends B> compareFn,
 A x)

Description copied from interface: Fn3

Partially apply this function by taking its first two arguments.

Specified by:

apply in interface Fn2<Fn1<? super A,? extends B extends Comparable<B>>,A,Fn1<A,Boolean>>

Specified by:

apply in interface Fn3<Fn1<? super A,? extends B extends Comparable<B>>,A,A,Boolean>

Parameters:

compareFn - the first argument

x - the second argument

Returns:

an Fn1<C, D>

cmpEqBy

public static <A,
B extends Comparable<B>>
CmpEqBy<A,B> cmpEqBy()

cmpEqBy

public static <A,
B extends Comparable<B>>
BiPredicate<A,A> cmpEqBy(Fn1<? super A,? extends B> compareFn)

cmpEqBy

public static <A,
B extends Comparable<B>>
Predicate<A> cmpEqBy(Fn1<? super A,? extends B> compareFn,
 A x)

cmpEqBy

public static <A,
B extends Comparable<B>> Boolean cmpEqBy(Fn1<? super A,? extends B> compareFn,
 A x,
 A y)