map-get-nongcthing.js

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// Return a new map, possibly filling some dummy entries to enforce creating

// multiple hash buckets.

function createMap(values, n) {

  var xs = [...values];

  for (var i = 0; i < n; ++i) {

    xs.push({});

  return new Map(xs.map((x, i) => [x, i + 1]));

function runTest(fn) {

  fn(0);

  fn(100);

function testInt32(n) {

  var xs = [1, 2];

  var ys = [3, 4];

  var zs = [...xs, ...ys];

  var map = createMap(xs, n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var z = zs[i & 3];

    var v = map.get(z);

    if (v !== undefined) c += v;

  assertEq(c, N / 2 + N / 4);

runTest(testInt32);

function testDouble(n) {

  var xs = [Math.PI, Infinity];

  var ys = [Math.E, -Infinity];

  var zs = [...xs, ...ys];

  var map = createMap(xs, n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var z = zs[i & 3];

    var v = map.get(z);

    if (v !== undefined) c += v;

  assertEq(c, N / 2 + N / 4);

runTest(testDouble);

function testZero(n) {

  var xs = [0, -0];

  var ys = [1, -1];

  var zs = [...xs, ...ys];

  var map = createMap([0], n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var z = zs[i & 3];

    var v = map.get(z);

    if (v !== undefined) c += v;

  assertEq(c, N / 2);

runTest(testZero);

function testNaN(n) {

  var xs = [NaN, -NaN];

  var ys = [1, -1];

  var zs = [...xs, ...ys];

  var map = createMap([NaN], n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var z = zs[i & 3];

    var v = map.get(z);

    if (v !== undefined) c += v;

  assertEq(c, N / 2);

runTest(testNaN);

function testUndefinedAndNull(n) {

  var xs = [undefined, null];

  var ys = [1, -1];

  var zs = [...xs, ...ys];

  var map = createMap(xs, n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var z = zs[i & 3];

    var v = map.get(z);

    if (v !== undefined) c += v;

  assertEq(c, N / 2 + N / 4);

runTest(testUndefinedAndNull);

function testBoolean(n) {

  var xs = [true, false];

  var ys = [1, -1];

  var zs = [...xs, ...ys];

  var map = createMap(xs, n);

  var N = 100;

  var c = 0;

  for (var i = 0; i < N; ++i) {

    var z = zs[i & 3];

    var v = map.get(z);

    if (v !== undefined) c += v;

  assertEq(c, N / 2 + N / 4);

runTest(testBoolean);