Function At

deps/v8/test/mjsunit/typedarray-growablesharedarraybuffer.js:800–827

(atHelper)

TestFill(ArrayFillHelper);

function At(atHelper) {
  for (let ctor of ctors) {
    const gsab = CreateGrowableSharedArrayBuffer(4 * ctor.BYTES_PER_ELEMENT,
                                                 8 * ctor.BYTES_PER_ELEMENT);
    const fixedLength = new ctor(gsab, 0, 4);
    const fixedLengthWithOffset = new ctor(gsab, 2 * ctor.BYTES_PER_ELEMENT, 2);
    const lengthTracking = new ctor(gsab, 0);
    const lengthTrackingWithOffset = new ctor(gsab, 2 * ctor.BYTES_PER_ELEMENT);

    // Write some data into the array.
    let ta_write = new ctor(gsab);
    for (let i = 0; i < 4; ++i) {
      WriteToTypedArray(ta_write, i, i);
    }

    assertEquals(3, atHelper(fixedLength, -1));
    assertEquals(3, atHelper(lengthTracking, -1));
    assertEquals(3, atHelper(fixedLengthWithOffset, -1));
    assertEquals(3, atHelper(lengthTrackingWithOffset, -1));

    // Grow. New memory is zeroed.
    gsab.grow(6 * ctor.BYTES_PER_ELEMENT);
    assertEquals(3, atHelper(fixedLength, -1));
    assertEquals(0, atHelper(lengthTracking, -1));
    assertEquals(3, atHelper(fixedLengthWithOffset, -1));
    assertEquals(0, atHelper(lengthTrackingWithOffset, -1));
  }
}
At(TypedArrayAtHelper);
At(ArrayAtHelper);