same-value-fold-null-or-undefined.js

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// Use different types to ensure we compile to MSameValue.

var xs = [

  null,

  undefined,

{},

  123,

  NaN,

  false,

  Symbol(),

"",

];

// Object.is(input, null) is folded to |input === null|.

function testNull() {

  for (var i = 0; i < 500; ++i) {

    var x = xs[i & 7];

    assertEq(Object.is(null, x), x === null);

    assertEq(Object.is(x, null), x === null);

for (let i = 0; i < 2; ++i) testNull();

// Object.is(input, undefined) is folded to |input === undefined|.

function testUndefined() {

  for (var i = 0; i < 500; ++i) {

    var x = xs[i & 7];

    assertEq(Object.is(undefined, x), x === undefined);

    assertEq(Object.is(x, undefined), x === undefined);

for (let i = 0; i < 2; ++i) testUndefined();