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LibJS: Implement Object.is()

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Basically === with two particularities: comparing NaN to itself is
considered equal and comparing +0 and -0 is not.
This commit is contained in:
Linus Groh 2020-04-26 00:27:54 +01:00 • committed by Andreas Kling
parent f191b84b50
commit 38ba13e912
4 changed files with 73 additions and 0 deletions
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53
Libraries/LibJS/Tests/Object.is.js Normal file
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@ -0,0 +1,53 @@
load("test-common.js");
try {
assert(Object.is.length === 2);
var a = [1, 2, 3];
var o = {foo: "bar"};
assert(Object.is("", "") === true);
assert(Object.is("foo", "foo") === true);
assert(Object.is(0, 0) === true);
assert(Object.is(+0, +0) === true);
assert(Object.is(-0, -0) === true);
assert(Object.is(1.23, 1.23) === true);
assert(Object.is(42, 42) === true);
assert(Object.is(NaN, NaN) === true);
assert(Object.is(Infinity, Infinity) === true);
assert(Object.is(+Infinity, +Infinity) === true);
assert(Object.is(-Infinity, -Infinity) === true);
assert(Object.is(true, true) === true);
assert(Object.is(false, false) === true);
assert(Object.is(null, null) === true);
assert(Object.is(undefined, undefined) === true);
assert(Object.is(undefined) === true);
assert(Object.is() === true);
assert(Object.is(a, a) === true);
assert(Object.is(o, o) === true);
assert(Object.is("test") === false);
assert(Object.is("foo", "bar") === false);
assert(Object.is(1, "1") === false);
assert(Object.is(+0, -0) === false);
assert(Object.is(-0, +0) === false);
assert(Object.is(42, 24) === false);
assert(Object.is(Infinity, -Infinity) === false);
assert(Object.is(-Infinity, +Infinity) === false);
assert(Object.is(true, false) === false);
assert(Object.is(false, true) === false);
assert(Object.is(undefined, null) === false);
assert(Object.is(null, undefined) === false);
assert(Object.is([], []) === false);
assert(Object.is(a, [1, 2, 3]) === false);
assert(Object.is([1, 2, 3], a) === false);
assert(Object.is({}, {}) === false);
assert(Object.is(o, {foo: "bar"}) === false);
assert(Object.is({foo: "bar"}, o) === false);
assert(Object.is(a, o) === false);
assert(Object.is(o, a) === false);
console.log("PASS");
} catch (e) {
console.log("FAIL: " + e);
}