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      1 // Copyright 2015 the V8 project authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 var typedArrayConstructors = [
      6   Uint8Array,
      7   Int8Array,
      8   Uint16Array,
      9   Int16Array,
     10   Uint32Array,
     11   Int32Array,
     12   Uint8ClampedArray,
     13   Float32Array,
     14   Float64Array
     15 ];
     16 
     17 for (var constructor of typedArrayConstructors) {
     18   // Check various variants of empty array's slicing.
     19   var array = new constructor(0);
     20   for (var i = 0; i < 7; i++) {
     21     assertEquals(0, array.slice(0, 0).length);
     22     assertEquals(0, array.slice(1, 0).length);
     23     assertEquals(0, array.slice(0, 1).length);
     24     assertEquals(0, array.slice(-1, 0).length);
     25   }
     26 
     27 
     28   // Check various forms of arguments omission.
     29   array = new constructor(7);
     30 
     31   for (var i = 0; i < 7; i++) {
     32     assertEquals(array, array.slice());
     33     assertEquals(array, array.slice(0));
     34     assertEquals(array, array.slice(undefined));
     35     assertEquals(array, array.slice("foobar"));
     36     assertEquals(array, array.slice(undefined, undefined));
     37   }
     38 
     39 
     40   // Check variants of negatives and positive indices.
     41   array = new constructor(7);
     42 
     43   assertEquals(7, array.slice(-100).length);
     44   assertEquals(3, array.slice(-3).length);
     45   assertEquals(3, array.slice(4).length);
     46   assertEquals(1, array.slice(6).length);
     47   assertEquals(0, array.slice(7).length);
     48   assertEquals(0, array.slice(8).length);
     49   assertEquals(0, array.slice(100).length);
     50 
     51   assertEquals(0, array.slice(0, -100).length);
     52   assertEquals(4, array.slice(0, -3).length);
     53   assertEquals(4, array.slice(0, 4).length);
     54   assertEquals(6, array.slice(0, 6).length);
     55   assertEquals(7, array.slice(0, 7).length);
     56   assertEquals(7, array.slice(0, 8).length);
     57   assertEquals(7, array.slice(0, 100).length);
     58 
     59   // Does not permit being called on other types
     60   assertThrows(function () {
     61     constructor.prototype.slice.call([], 0, 0);
     62   }, TypeError);
     63 
     64   // Check that elements are copied properly in slice
     65   array = new constructor([1, 2, 3, 4]);
     66   var slice = array.slice(1, 3);
     67   assertEquals(2, slice.length);
     68   assertEquals(2, slice[0]);
     69   assertEquals(3, slice[1]);
     70   assertTrue(slice instanceof constructor);
     71 }
     72