CODE EXAMPLE FOR TYPESCRIPT

Convert HTMLCollection to an array with JavaScript

function BoxAppearence() {
  var BoxCollection = document.getElementsByClassName("Box");
  var BoxArray = Array.from(BoxCollection);
  
  console.log("### BoxCollection ###");
  console.log("Is 'BoxCollection' an array?", Array.isArray(BoxCollection));
  console.log(BoxCollection);
  console.log(BoxCollection[12])
  console.log('

');
  console.log("### BoxArray ###");
  console.log("Is 'BoxArray' an array?", Array.isArray(BoxArray));
  console.log(BoxArray);
  console.log(BoxArray[12]);
}

BoxAppearence();