JSTests/test262/test/built-ins/TypedArray/prototype/find/predicate-not-called-on-empty-array.js

// 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.find
description: >
  Predicate is not called on empty instances
info: |
  22.2.3.10 %TypedArray%.prototype.find (predicate [ , thisArg ] )

  %TypedArray%.prototype.find is a distinct function that implements the same
  algorithm as Array.prototype.find as defined in 22.1.3.8 except that the this
  object's [[ArrayLength]] internal slot is accessed in place of performing a
  [[Get]] of "length". The implementation of the algorithm may be optimized with
  the knowledge that the this value is an object that has a fixed length and
  whose integer indexed properties are not sparse.

  ...

  22.1.3.8 Array.prototype.find ( predicate[ , thisArg ] )

  ...
  6. Repeat, while k < len
    ...
    c. Let testResult be ToBoolean(? Call(predicate, T, « kValue, k, O »)).
  ...
includes: [testTypedArray.js]
features: [TypedArray]
---*/

testWithTypedArrayConstructors(function(TA) {
  var sample = new TA();
  var called = false;

  var result = sample.find(function() {
    called = true;
    return true;
  });

  assert.sameValue(
    called,
    false,
    "empty instance does not call predicate"
  );
  assert.sameValue(
    result,
    undefined,
    "find returns undefined when predicate is not called"
  );
});