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findIndex()

findIndex<T>(predicate): (arr) => number

Returns the first index of the given array that satisfies the predicate. Returns -1 otherwise.

Type Parameters​

• T

Parameters​

predicate​

Predicate<T>

A predicate function to apply to each element of the array.

Returns​

Function

Parameters​

arr​

T[]

Returns​

number

Remark​

pure function

Example​

findIndex(x => !(x & 1))([1, 2, 3, 4, 5]);
// 1