mapmaybeInt

mapmaybeInt is a functional programming concept and utility that combines the idea of mapping functions over data structures with optional integer values. It is typically used in languages that support optional types or nullable values, such as Haskell, Scala, or TypeScript.

The primary purpose of mapmaybeInt is to apply a function to an optional integer value, but only if the value exists. If the optional contains a valid integer (sometimes called a "just" or "some" value), the function is applied, and the result, which is also optional, is returned. If the value is absent (i.e., "nothing" or "none"), the operation results in an absent value, thereby preserving the optional semantics.

This utility is especially useful in scenarios where multiple transformations need to be performed on optional values without explicitly checking for their existence at each step. It promotes clean, concise code by chaining operations in a safe manner, avoiding runtime errors due to null or undefined values.

In hypothetical implementations, mapmaybeInt can be represented as a higher-order function, which takes a function (from integer to integer) and an optional integer, returning a new optional integer. For example, in TypeScript, such a function might look like:

function mapMaybeInt(fn: (n: number) => number, optVal: number | null): number | null {

return optVal !== null ? fn(optVal) : null;

}

Overall, mapmaybeInt simplifies handling optional data, enabling more robust and readable code for transformations involving nullable integers.