code: function find(arr, check) {
    // use native find if supported
    if (Array.prototype.find) {
      return arr.find(check);
    }
  
    // use `filter` to obtain the same behavior of `find`
    return arr.filter(check)[0];
  }
docs: Mimics the `find` method of Array
  @method
  @memberof Popper.Utils
  @argument {Array} arr
  @argument prop
  @argument value
  @returns index or -1