1 files changed, 41 insertions, 0 deletions
diff --git a/qutebrowser/javascript/quirks/array_at.user.js b/qutebrowser/javascript/quirks/array_at.user.js
new file mode 100644
index 000000000..1e4218439
--- /dev/null
+++ b/qutebrowser/javascript/quirks/array_at.user.js
@@ -0,0 +1,41 @@
+// ==UserScript==
+// @include https://*.linkedin.com/*
+// @include https://test.qutebrowser.org/*
+// ==/UserScript==
+//
+// Based on: https://github.com/tc39/proposal-relative-indexing-method#polyfill
+
+/* eslint-disable no-invalid-this */
+
+"use strict";
+
+(function() {
+    function at(idx) {
+        // ToInteger() abstract op
+        let n = Math.trunc(idx) || 0;
+        // Allow negative indexing from the end
+        if (n < 0) {
+            n += this.length;
+        }
+        // OOB access is guaranteed to return undefined
+        if (n < 0 || n >= this.length) {
+            return undefined;
+        }
+        // Otherwise, this is just normal property access
+        return this[n];
+    }
+
+    const TypedArray = Reflect.getPrototypeOf(Int8Array);
+    for (const type of [Array, String, TypedArray]) {
+        Object.defineProperty(
+            type.prototype,
+            "at",
+            {
+                "value": at,
+                "writable": true,
+                "enumerable": false,
+                "configurable": true,
+            }
+        );
+    }
+})();