Javascript Undefined

AllesGif'jesStickersMemes
a pair of hearts with the word javascript on one
a computer screen shows where to get apps
a poster for minecraft java edition with hearts on it
a man in a pink shirt and plaid shorts is a minecraft character
a minecraft character with a beard and blue eyes
a man sitting in front of a computer with the words undefined is not a function
a red block in a video game with the words " who are we looking for "
a minecraft scene with a person holding a torch in a cave
a pixel art drawing of a minecraft character
a poster that says i am the ranger hangs on a wall above a tv