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+// Copyright (C) 2016 the V8 project authors. All rights reserved.
+// This code is governed by the BSD license found in the LICENSE file.
+/*---
+esid: sec-%typedarray%.prototype.reduce
+description: >
+  Returns last accumulator value
+info: |
+  22.2.3.20 %TypedArray%.prototype.reduce ( callbackfn [ , initialValue ] )
+
+  %TypedArray%.prototype.reduce is a distinct function that implements the same
+  algorithm as Array.prototype.reduce as defined in 22.1.3.19 except that the
+  this object's [[ArrayLength]] internal slot is accessed in place of performing
+  a [[Get]] of "length".
+
+  22.1.3.19 Array.prototype.reduce ( callbackfn [ , initialValue ] )
+
+  ...
+  7. Else initialValue is not present,
+    ...
+    b. Repeat, while kPresent is false and k < len
+      ...
+      iii. If kPresent is true, then
+        1. Let accumulator be ? Get(O, Pk).
+      iv. Increase k by 1.
+    ...
+  8. Repeat, while k < len
+    ...
+    c. If kPresent is true, then
+      i. Let kValue be ? Get(O, Pk).
+      ii. Let accumulator be ? Call(callbackfn, undefined, « accumulator,
+      kValue, k, O »).
+  9. Return accumulator.
+includes: [testBigIntTypedArray.js]
+features: [BigInt, TypedArray]
+---*/
+
+testWithBigIntTypedArrayConstructors(function(TA) {
+  var calls, result;
+
+  calls = 0;
+  result = new TA(convertToBigInt([1, 2, 3])).reduce(function() {
+    calls++;
+
+    if (calls == 2) {
+      return 42;
+    }
+  });
+  assert.sameValue(result, 42, "using default accumulator");
+
+  calls = 0;
+  result = new TA(convertToBigInt([1, 2, 3])).reduce(function() {
+    calls++;
+
+    if (calls == 3) {
+      return 7;
+    }
+  }, 0);
+  assert.sameValue(result, 7, "using custom accumulator");
+});