Check if a value is undefined. ```javascript const lolite = require("lolite.isundefined") const assert = require("node:assert")
npm install lolite.isundefinedjavascript
const lolite = require("lolite.isundefined")
const assert = require("node:assert")
assert.ok(lolite.isUndefined(undefined))
assert.ok(lolite.isUndefined()) // if you pass nothing into a function, JS coerces to undefined
assert.ok(!lolite.isUndefined("anything else"))
``