text: // Copyright 2015 the V8 project authors. All rights reserved.
  // Use of this source code is governed by a BSD-style license that can be
  // found in the LICENSE file.
  
  // Flags: --allow-natives-syntax
  
  var typedArrayConstructors = [
    Uint8Array,
    Int8Array,
    Uint16Array,
    Int16Array,
    Uint32Array,
    Int32Array,
    Uint8ClampedArray,
    Float32Array,
    Float64Array
  ];
  
  for (var constructor of typedArrayConstructors) {
    // Check various variants of empty array's slicing.
    var array = new constructor(0);
    for (var i = 0; i < 7; i++) {
      assertEquals(0, array.slice(0, 0).length);
      assertEquals(0, array.slice(1, 0).length);
      assertEquals(0, array.slice(0, 1).length);
      assertEquals(0, array.slice(-1, 0).length);
    }
  
  
    // Check various forms of arguments omission.
    array = new constructor(7);
  
    for (var i = 0; i < 7; i++) {
      assertEquals(array, array.slice());
      assertEquals(array, array.slice(0));
      assertEquals(array, array.slice(undefined));
      assertEquals(array, array.slice("foobar"));
      assertEquals(array, array.slice(undefined, undefined));
    }
  
  
    // Check variants of negatives and positive indices.
    array = new constructor(7);
  
    assertEquals(7, array.slice(-100).length);
    assertEquals(3, array.slice(-3).length);
    assertEquals(3, array.slice(4).length);
    assertEquals(1, array.slice(6).length);
    assertEquals(0, array.slice(7).length);
    assertEquals(0, array.slice(8).length);
    assertEquals(0, array.slice(100).length);
  
    assertEquals(0, array.slice(0, -100).length);
    assertEquals(4, array.slice(0, -3).length);
    assertEquals(4, array.slice(0, 4).length);
    assertEquals(6, array.slice(0, 6).length);
    assertEquals(7, array.slice(0, 7).length);
    assertEquals(7, array.slice(0, 8).length);
    assertEquals(7, array.slice(0, 100).length);
  
    // Does not permit being called on other types
    assertThrows(() => constructor.prototype.slice.call([], 0, 0), TypeError);
  
    // Check that elements are copied properly in slice
    array = new constructor([1, 2, 3, 4]);
    var slice = array.slice(1, 3);
    assertEquals(2, slice.length);
    assertEquals(2, slice[0]);
    assertEquals(3, slice[1]);
    assertTrue(slice instanceof constructor);
  
    // Detached Operation
    var tmp = {
      [Symbol.toPrimitive]() {
        assertUnreachable("Parameter should not be processed when " +
                          "array.[[ViewedArrayBuffer]] is neutered.");
        return 0;
      }
    };
    var array = new constructor([1, 2, 3, 4, 5, 6, 7, 8, 9, 10]);
    %ArrayBufferNeuter(array.buffer);
    assertThrows(() => array.slice(tmp, tmp), TypeError);
  
    // Check that the species array must be a typed array
    class MyTypedArray extends constructor {
      static get[Symbol.species]() {
        return Array;
      }
    }
    var arr = new MyTypedArray([-1.0, 0, 1.1, 255, 256]);
    assertThrows(() => arr.slice(), TypeError);
  }
  
  // Check that the result array is properly created by checking species
  for (var constructor1 of typedArrayConstructors) {
    for (var constructor2 of typedArrayConstructors) {
      testCustomSubclass(constructor1, constructor2);
      testSpeciesConstructor(constructor1, constructor2);
    }
  }
  
  function testSpeciesConstructor(cons1, cons2) {
    var ta = new cons1([1, 2, 3, 4, 5, 6]);
    ta.constructor = {
      [Symbol.species]: cons2
    };
    assertArrayEquals([4, 5, 6], ta.slice(3));
  }
  
  function testCustomSubclass(superClass, speciesClass) {
    // Simple subclass that has another TypedArray as species
    class CustomTypedArray extends superClass {
      static get[Symbol.species]() {
        return speciesClass;
      }
    }
    // 16 entries.
    let exampleArray = [-1.0, 0, 1.1, 255, 256, 0xFFFFFFFF, 2**50, NaN];
    let customArray = new CustomTypedArray(exampleArray);
    let basicArray = new superClass(exampleArray);
    assertEquals(new speciesClass(basicArray), customArray.slice(),
                 superClass.name + ' -> ' + speciesClass.name);
  
    // Custom constructor with shared buffer.
    exampleArray =  new Array(64).fill(0).map((v,i) => i);
    let filledBuffer = new Uint8Array(exampleArray).buffer;
    // Create a view for the beginning of the buffer.
    let customArray2 = new superClass(filledBuffer, 0, 3);
    customArray2.constructor = {
      [Symbol.species]: function(length) {
        let bytes_per_element = speciesClass.BYTES_PER_ELEMENT;
        // Reuse the same buffer for the custom species constructor.
        // Skip the first BYTES_PER_ELEMENT bytes of the buffer.
        return new speciesClass(filledBuffer, bytes_per_element, length);
      }
    };
    // Since slice is defined iteratively, the species created new array uses the
    // same underlying buffer shifted by one element. Hence the first value is
    // copied over and over again.
    let convertedCopy = Array.from(customArray2);
    let firstValue = convertedCopy[0];
    assertEquals(firstValue, customArray2[0]);
    let sliceResult = customArray2.slice();
    if (superClass == speciesClass) {
      assertEquals(new Array(3).fill(firstValue), Array.from(customArray2));
      assertEquals(new Array(3).fill(firstValue), Array.from(sliceResult));
    }
    assertEquals(3, customArray2.length);
    assertEquals(3, sliceResult.length);
  }
  