first-value

Retrieves the first value of an Array, Iterator, Object, Map, Set, or Typed Array.

Returns undefined if the collection is empty.

Installation

Requires Node.js 7.0.0 or above.

npm i first-value

API

The module exports a single function.

Parameter

Bindable: c (Array, Iterator, Object, Map, Set, or Typed Array): The collection of entries/values.

Return Value

The first value in the collection.

Example

const firstValue = require('first-value')

firstValue([1, 2, 3]) // 1
firstValue({a: 1, b: 2}) // 1
firstValue(new Set([1, 2, 3])) // 1
firstValue(new Map([['a', 1], ['b', 2]])) // 1

firstValue([]) // undefined

Related

• last-value