effect-io-ai

Package: effect
Module: Array

Array.init

Returns all elements except the last safely, wrapped in an Option.

When to use

Use to safely get all elements before the last when the iterable may be empty.

Details

Allocates a new array via slice(0, -1). Empty inputs return Option.none().

Example (Getting init)

import { Array } from "effect"

console.log(Array.init([1, 2, 3, 4])) // Option.some([1, 2, 3])
console.log(Array.init([])) // Option.none()

See

• initNonEmpty — when the array is known non-empty
• tail — all elements except the first

Signature

declare const init: <A>(self: Iterable<A>) => Option.Option<Array<A>>

Source

Since v2.0.0