sidferreira

function flatten_es5(items) {
  if (!items || !Array.isArray(items)) {
    return []
  }
  var flattened = []
  for(var value of items) {
    if (Array.isArray(value)) {
      flattened = flattened.concat(flatten_es5(value))
    } else {
      flattened.push(value)