isUndefined | /is_undefined.ts | isx@1.1.1

Collection of validation functions for JavaScript data

function isUndefined

import { isUndefined } from "https://deno.land/x/isx@1.1.1/is_undefined.ts";

isUndefined(input: unknown): input is undefined

Whether the input is undefined or not.

Examples

Example 1

import { isUndefined } from "https://deno.land/x/isx@$VERSION/is_undefined.ts"
import { assertEquals } from "https://deno.land/std/testing/asserts.ts"
assertEquals(isUndefined(undefined), true)
assertEquals(isUndefined(null), false)

Parameters

input: unknown

Any input.

Returns

input is undefined