Issue 4657 - Add Acceptable Ads API

lib/compat.js

Index: lib/compat.js
diff --git a/lib/compat.js b/lib/compat.js
index 42b86716988e7ca174b4e61b0be4e564cefb30ec..ace5b42e5ffed05deb8704c6534936fcf1e4dcf0 100644
--- a/lib/compat.js
+++ b/lib/compat.js
@@ -443,3 +443,48 @@ XMLHttpRequest.prototype =
     }
   }
 };
+
+
+// Polyfill Array.prototype.find
+// from https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Array/find
+// https://tc39.github.io/ecma262/#sec-array.prototype.find
+if (!Array.prototype.find) {
+  Object.defineProperty(Array.prototype, 'find', {
+    value: function (predicate) {
+      // 1. Let O be ? ToObject(this value).
+      if (this == null) {
+        throw new TypeError('"this" is null or not defined');
+      }
+
+      var o = Object(this);
+
+      // 2. Let len be ? ToLength(? Get(O, "length")).
+      var len = o.length >>> 0;
+
+      // 3. If IsCallable(predicate) is false, throw a TypeError exception.
+      if (typeof predicate !== 'function') {
+        throw new TypeError('predicate must be a function');
+      }
+
+      // 4. If thisArg was supplied, let T be thisArg; else let T be undefined.
+      var thisArg = arguments[1];
+
+      // 5. Let k be 0.
+      var k = 0;
+
+      // 6. Repeat, while k < len
+      while (k < len) {
+        // a. Let Pk be ! ToString(k).
+        // b. Let kValue be ? Get(O, Pk).
+        // c. Let testResult be ToBoolean(? Call(predicate, T, "kValue, k, O")).
+        // d. If testResult is true, return kValue.
+        var kValue = o[k];
+        if (predicate.call(thisArg, kValue, k, o)) {
+          return kValue;
+        }
+        // e. Increase k by 1.
+        k++;
+      }
+    }
+  });
+}