From: Tom Hughes <tom@compton.nu>
Date: Tue, 29 Jan 2019 23:14:25 +0000 (+0000)
Subject: Add polyfill for Array.prototype.findIndex
X-Git-Tag: live~2726
X-Git-Url: https://git.openstreetmap.org/rails.git/commitdiff_plain/b040955b547556fa85fbcc4760f8f5b53ba36773

Add polyfill for Array.prototype.findIndex

Fixes #2124
---

diff --git a/vendor/assets/augment.js/augment.js b/vendor/assets/augment.js/augment.js
index 0bf2fd47c..33f03908f 100644
--- a/vendor/assets/augment.js/augment.js
+++ b/vendor/assets/augment.js/augment.js
@@ -395,3 +395,50 @@ if (!Object.keys) {
     }
   })()
 };
+// https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/findIndex
+// https://tc39.github.io/ecma262/#sec-array.prototype.findindex
+if (!Array.prototype.findIndex) {
+  Object.defineProperty(Array.prototype, 'findIndex', {
+    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 k.
+        var kValue = o[k];
+        if (predicate.call(thisArg, kValue, k, o)) {
+          return k;
+        }
+        // e. Increase k by 1.
+        k++;
+      }
+
+      // 7. Return -1.
+      return -1;
+    },
+    configurable: true,
+    writable: true
+  });
+}