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Bug 839979 - Implement Object.is. r=jorendorff

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This commit is contained in:
Tom Schuster 2013-03-28 15:46:44 +01:00
parent e21bd39ae2
commit e39915f6c6
2 changed files with 56 additions and 0 deletions
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15
js/src/builtin/Object.cpp
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@ -791,6 +791,20 @@ obj_keys(JSContext *cx, unsigned argc, Value *vp)
return true;
}
/* ES6 draft 15.2.3.16 */
static JSBool
obj_is(JSContext *cx, unsigned argc, Value *vp)
{
CallArgs args = CallArgsFromVp(argc, vp);
bool same;
if (!SameValue(cx, args.get(0), args.get(1), &same))
return false;
args.rval().setBoolean(same);
return true;
}
static JSBool
obj_getOwnPropertyNames(JSContext *cx, unsigned argc, Value *vp)
{
@ -982,6 +996,7 @@ JSFunctionSpec js::object_static_methods[] = {
JS_FN("getPrototypeOf", obj_getPrototypeOf, 1,0),
JS_FN("getOwnPropertyDescriptor", obj_getOwnPropertyDescriptor,2,0),
JS_FN("keys", obj_keys, 1,0),
JS_FN("is", obj_is, 2,0),
JS_FN("defineProperty", obj_defineProperty, 3,0),
JS_FN("defineProperties", obj_defineProperties, 2,0),
JS_FN("create", obj_create, 2,0),

41
js/src/jit-test/tests/basic/object-is.js Normal file
View File

@ -0,0 +1,41 @@
/*
* Any copyright is dedicated to the Public Domain.
* http://creativecommons.org/licenses/publicdomain/
*/
var list = [
[1, 1, true],
[0, 1, false],
[3.5, 3.5, true],
[0, 0, true],
[0, -0, false],
[-0, 0, false],
[-0, -0, true],
[true, true, true],
[true, false, false],
[false, false, true],
[NaN, NaN, true],
[NaN, undefined, false],
[Infinity, -Infinity, false],
[Infinity, Infinity, true],
]
for (var test of list) {
assertEq(Object.is(test[0], test[1]), test[2])
}
var obj = {}
assertEq(Object.is(obj, obj), true);
assertEq(Object.is(obj, {}), false);
assertEq(Object.is([], []), false);
assertEq(Object.is(null, null, null), true);
/* Not defined parameters are undefined ... */
assertEq(Object.is(null), false);
assertEq(Object.is(undefined), true);
assertEq(Object.is(), true);
assertEq(Object.is.length, 2);