Add `.find` polyadd-find-poly

2 files changed, 24 insertions, 8 deletions

diff --git a/app/assets/javascripts/extensions/array.js b/app/assets/javascripts/extensions/array.js
deleted file mode 100644
index fc6c130113d..00000000000
--- a/app/assets/javascripts/extensions/array.js
+++ /dev/null
@@ -1,8 +0,0 @@
-/* eslint-disable no-extend-native, func-names, space-before-function-paren, semi, space-infix-ops, max-len */
-Array.prototype.first = function() {
-  return this[0];
-}
-
-Array.prototype.last = function() {
-  return this[this.length-1];
-}
diff --git a/app/assets/javascripts/extensions/array.js.es6 b/app/assets/javascripts/extensions/array.js.es6
new file mode 100644
index 00000000000..717566a4715
--- /dev/null
+++ b/app/assets/javascripts/extensions/array.js.es6
@@ -0,0 +1,24 @@
+/* eslint-disable no-extend-native, func-names, space-before-function-paren, semi, space-infix-ops, max-len */
+Array.prototype.first = function() {
+  return this[0];
+}
+
+Array.prototype.last = function() {
+  return this[this.length-1];
+}
+
+Array.prototype.find = Array.prototype.find || function(predicate, ...args) {
+  if (!this) throw new TypeError('Array.prototype.find called on null or undefined');
+  if (typeof predicate !== 'function') throw new TypeError('predicate must be a function');
+
+  const list = Object(this);
+  const thisArg = args[1];
+  let value = {};
+
+  for (let i = 0; i < list.length; i += 1) {
+    value = list[i];
+    if (predicate.call(thisArg, value, i, list)) return value;
+  }
+
+  return undefined;
+};