why we are have error

Question

for(var i=0;i<100;i++){
var cell = document.createElement("div")
cell.classList.add("cell")
document.getElementsByClassName("board").appendChild(cell)
}

errooooooor:
Uncaught TypeError: document.getElementsByClassName(...).appendChild is not a function

Answer 1

document.getElementsByClassName("board") is returns an array, not a single item, if "board" Class exists. So you can't apply appendChild to array of elements directly..