Javascript Undefined

TodoGIFsCalcomaníasMemes
a pair of hearts with the word javascript on one
a computer screen shows where to get apps
a screenshot of a my board with a to do list
a girl in a pink dress is standing on a stage with the words " raizel isnt online all is well " on the bottom
a cartoon dog says " hold on " in white letters
a man sitting in front of a computer with the words undefined is not a function
a woman in a red dress is holding a microphone and saying you get an undefined variable
three women in silver jumpsuits with the words null and void above them
a picture of a girl with the words jane thursday
a man in a polka dot shirt stands in front of a park with the word confidence written on the bottom