effect-io-ai

Package: effect
Module: Array

Array.filterMapWhile

Applies a function to each element of the array and filters based on the result, stopping when a condition is not met. This method combines filtering and mapping in a single pass, and short-circuits, i.e., stops processing, as soon as the function returns None. This is useful when you need to transform an array but only up to the point where a certain condition holds true.

Example

import { Array, Option } from "effect"

const toSquareTillOdd = (x: number) => x % 2 === 0 ? Option.some(x * x) : Option.none()

const result = Array.filterMapWhile([2, 4, 5], toSquareTillOdd)
console.log(result) // [4, 16]

Signature

declare const filterMapWhile: { <A, B>(f: (a: A, i: number) => Option.Option<B>): (self: Iterable<A>) => Array<B>; <A, B>(self: Iterable<A>, f: (a: A, i: number) => Option.Option<B>): Array<B>; }

Source

Since v2.0.0