text: // Copyright 2018 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];
  
  function TestTypedArrayFilter(constructor) {
    assertEquals(1, constructor.prototype.filter.length);
  
    // Throw type error if source array is detached while executing a callback
    let ta1 = new constructor(10);
    assertThrows(() =>
      ta1.filter(() => %ArrayBufferNeuter(ta1.buffer))
    , TypeError);
  
    // A new typed array should be created after finishing callbacks
    var speciesCreated = 0;
  
    class MyTypedArray extends constructor {
      static get [Symbol.species]() {
        return function() {
          speciesCreated++;
          return new constructor(10);
        };
      }
    }
  
    new MyTypedArray(10).filter(() => {
      assertEquals(0, speciesCreated);
      return true;
    });
    assertEquals(1, speciesCreated);
  
    // A new typed array should be initialized to 0s
    class LongTypedArray extends constructor {
      static get [Symbol.species]() {
        return function(len) {
          return new constructor(len * 2);
        }
      }
    }
    let ta2 = new LongTypedArray(3).fill(1);
    let ta3 = ta2.filter((val, index, array) => val > 0);
    assertArrayEquals(ta3, [1, 1, 1, 0, 0, 0]);
    assertEquals(ta3.constructor, constructor);
  
    // Throw if a new typed array is too small
    class ShortTypedArray extends constructor {
      static get [Symbol.species]() {
        return function(len) {
          return new constructor(len/2);
        }
      }
    }
    assertThrows(() => new ShortTypedArray(10).filter(() => true));
  
    // Throw if callback is not callable
    assertThrows(() => new constructor(10).filter(123));
    assertThrows(() => new constructor(10).filter({}));
  
    // Empty result
    assertEquals(new constructor(10).filter(() => false), new constructor(0));
  
    // If a new typed array shares a buffer with a source array
    let ab = new ArrayBuffer(100);
    class SharedBufferTypedArray extends constructor {
      static get [Symbol.species]() {
        return function(len) {
          return new constructor(ab, 0, 5);
        }
      }
    }
    let ta4 = new SharedBufferTypedArray(ab, 0, 5).fill(1);
    let ta5 = ta4.filter(() => {
      ta4[0] = 123;
      ta4[2] = 123;
      return true;
    });
    assertEquals(ta4.buffer, ta5.buffer);
    assertArrayEquals(ta4, [1, 1, 123, 1, 1]);
    assertArrayEquals(ta5, [1, 1, 123, 1, 1]);
  
    // If a new typed array has a different type with source array
    for (let j = 0; j < typedArrayConstructors.length; j++) {
      let otherConstructor = typedArrayConstructors[j];
      class OtherTypedArray extends constructor {
        static get [Symbol.species]() {
          return function(len) {
            return new otherConstructor(len);
          }
        }
      }
      let ta6 = new OtherTypedArray(10).fill(123);
      assertEquals(ta6.filter(() => true), new otherConstructor(10).fill(123));
    }
  }
  
  for (i = 0; i < typedArrayConstructors.length; i++) {
    TestTypedArrayFilter(typedArrayConstructors[i]);
  }
  