public <U1, U2, U3, U4> Tuple4<U1, U2, U3, U4> map(
Function1<? super T1, ? extends U1> f1,
Function1<? super T2, ? extends U2> f2,
Function1<? super T3, ? extends U3> f3,
Function1<? super T4, ? extends U4> f4) {
return map(
(t1, t2, t3, t4) -> Tuple.of(f1.apply(t1), f2.apply(t2), f3.apply(t3), f4.apply(t4)));
}
/**
* Lifts the given {@code partialFunction} into a total function that returns an {@code Option}
* result.
*
* @param partialFunction a function that is not defined for all values of the domain (e.g. by
* throwing)
* @param <R> return type
* @param <T1> 1st argument
* @return a function that applies arguments to the given {@code partialFunction} and returns
* {@code Some(result)} if the function is defined for the given arguments, and {@code None}
* otherwise.
*/
static <T1, R> Function1<T1, Option<R>> lift(Function1<T1, R> partialFunction) {
return (t1) -> Try.of(() -> partialFunction.apply(t1)).getOption();
}
/**
* Returns a composed function that first applies this Function2 to the given argument and then
* applies {@linkplain Function1} {@code after} to the result.
*
* @param <V> return type of after
* @param after the function applied after this
* @return a function composed of this and after
* @throws NullPointerException if after is null
*/
default <V> Function2<T1, T2, V> andThen(Function1<? super R, ? extends V> after) {
Objects.requireNonNull(after, "after is null");
return (t1, t2) -> after.apply(apply(t1, t2));
}
/**
* Returns a composed function that first applies the {@linkplain Function1} {@code before} the
* given argument and then applies this Function1 to the result.
*
* @param <V> argument type of before
* @param before the function applied before this
* @return a function composed of before and this
* @throws NullPointerException if before is null
*/
default <V> Function1<V, R> compose(Function1<? super V, ? extends T1> before) {
Objects.requireNonNull(before, "before is null");
return v -> apply(before.apply(v));
}
public <U1> Tuple1<U1> map(Function1<? super T1, ? extends U1> f) {
return new Tuple1<>(f.apply(_1));
}