The IntToDoubleFunction Interface is a part of the java.util.function package which has been introduced since Java 8, to implement functional programming in Java. It represents a function which takes in an int-valued argument and gives a double-valued result.
The lambda expression assigned to an object of IntToDoubleFunction type is used to define its applyAsDouble() which eventually applies the given operation on its only argument. It is similar to using an object of type Function<Integer, Double> .
The IntToDoubleFunction interface has only one function:
double applyAsDouble(int value)
Parameters: This method takes in one parameter value which is the int-valued argument
Returns: This method returns a double-valued result.
Below is the code to illustrate applyAsDouble() method:
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