Java : IntToDoubleFunction with Examples

IntToDoubleFunction (Java SE 24 & JDK 24) in Java with Examples.
You will find code samples for most of the IntToDoubleFunction methods.

Summary

Represents a function that accepts an int-valued argument and produces a double-valued result. This is the int-to-double primitive specialization for Function.

Class diagram

final var stream = IntStream.of(1, 3, 5);

final var func = new IntToDoubleFunction() {
    @Override
    public double applyAsDouble(int value) {
        return value / 2.0;
    }
};

final var ret = stream.mapToDouble(func).toArray();
System.out.println(Arrays.toString(ret)); // [0.5, 1.5, 2.5]

// An example with a lambda expression.
final var stream = IntStream.of(1, 3, 5);

final var ret = stream.mapToDouble(value -> {
    return value / 2.0;
}).toArray();
System.out.println(Arrays.toString(ret)); // [0.5, 1.5, 2.5]

Methods

double applyAsDouble (int value)

Applies this function to the given argument.

final var stream = IntStream.of(1, 3, 5);

final var func = new IntToDoubleFunction() {
    @Override
    public double applyAsDouble(int value) {
        return value / 2.0;
    }
};

final var ret = stream.mapToDouble(func).toArray();
System.out.println(Arrays.toString(ret)); // [0.5, 1.5, 2.5]

// An example with a lambda expression.
final var stream = IntStream.of(1, 3, 5);

final var ret = stream.mapToDouble(value -> {
    return value / 2.0;
}).toArray();
System.out.println(Arrays.toString(ret)); // [0.5, 1.5, 2.5]

API Examples

Java : IntToDoubleFunction with Examples

Summary

Methods

double applyAsDouble (int value)

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