indexOf()

indexOf<T>(x): (arr) => number

Returns the first index as which a given element can be found in the array. Returns -1 otherwise.

Type Parameters

• T

Parameters

x

T

The value to find in the array.

Returns

Function

Parameters

arr

T[]

Returns

number

Remark

pure function

Example

indexOf(3)([[1, 2, 3, 4, 5]])
// 2