effect-io-ai

Package: effect
Module: Effect

Effect.takeWhile

Takes elements as long as the predicate returns true.

Details

This function processes a collection of elements and uses a predicate to decide whether to take an element.

The predicate is a function that takes an element and its index, and it returns an effect that evaluates to a boolean.

As long as the predicate returns true, elements will continue to be taken from the collection.

Once the predicate returns false, the remaining elements are discarded.

Example

import { Effect } from "effect"

const numbers = [1, 2, 3, 4, 5, 6]
const predicate = (n: number, i: number) => Effect.succeed(n <= 3)

const program = Effect.gen(function*() {
  const result = yield* Effect.takeWhile(numbers, predicate)
  console.log(result)
})

Effect.runFork(program)
// Output: [1, 2, 3]

See

• takeUntil for a similar function that takes elements until the predicate returns true.

Signature

declare const takeWhile: { <A, E, R>(predicate: (a: NoInfer<A>, i: number) => Effect<boolean, E, R>): (elements: Iterable<A>) => Effect<Array<A>, E, R>; <A, E, R>(elements: Iterable<A>, predicate: (a: NoInfer<A>, i: number) => Effect<boolean, E, R>): Effect<Array<A>, E, R>; }

Source

Since v2.0.0