var xTick = document.getElementsByClassName('some class name')

console.log(xTick)
output:
    HTMLCollection []
    > 0: text
    > 1: text
    > 2: text
    ...
    > 8: text
    > 9: text
      length: 10
    > __proto__: HTMLCollection


console.log(xTick.length)
output: 0


console.log(xTick[0])
output: undefined