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x/rambda/immutable.d.ts>findIndex

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function findIndex
import { findIndex } from "https://deno.land/x/rambda@v7.0.1/immutable.d.ts";

It returns the index of the first element of list satisfying the predicate function.

If there is no such element, then -1 is returned.

Parameters

predicate: (x: T) => boolean
list: readonly T[]

Returns

number

Parameters

predicate: (x: T) => boolean

Returns

(list: readonly T[]) => number