gitlab-org--gitlab-foss/app/assets/javascripts/extensions/array.js

// TODO: remove this

// eslint-disable-next-line no-extend-native
Array.prototype.first = function first() {
  return this[0];
};

// eslint-disable-next-line no-extend-native
Array.prototype.last = function last() {
  return this[this.length - 1];
};