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clone.js
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clone.js
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/*
* use mocha to test me
* http://visionmedia.github.com/mocha/
*/
if (this['window'] !== this) {
require('./helper.js');
require('../es2pi.js');
}
(function(root){
'use strict';
var falsies = [null, void(0), false, +0, -0, NaN, ''];
describe('Object.is(nt)?', function () {
falsies.concat([[],{}]).forEach(function(v) {
it('Object.is('+v+','+v+') === true',
eq(Object.is(v,v), true));
});
it('Object.is(NaN,NaN) === true', eq(Object.is(NaN,NaN), true));
it('Object.isnt(NaN,NaN) === false', eq(Object.isnt(NaN,NaN), false));
it('Object.is(+0,-0) === false', eq(Object.is(+0,-0), false));
it('Object.isnt(+0,-0) === true', eq(Object.isnt(+0,-0), true));
});
var wrappers = {Boolean:Boolean, Number:Number, String:String};
var jsonStr = function(o){ return JSON.stringify(o) };
describe('Object.equals', function () {
falsies.concat([[],{}]).forEach(function(v) {
it('Object.equals('+v+','+v+')===true',
eq(Object.equals(v,v), true));
});
// .is vs .equals
it('Object.is([],[]) === false', eq(Object.is([],[]), false));
it('Object.equals([],[]) === true', eq(Object.equals([],[]), true));
it('Object.is({},{}) === false', eq(Object.is([],[]), false));
it('Object.equals({},{}) === true', eq(Object.equals([],[]), true));
Object.keys(wrappers).forEach(function(k) {
it('Object.is(new '+k+',new ' +k+')===false',
eq(Object.is(new wrappers[k], new wrappers[k]), false));
it('Object.equals(new '+k+',new ' +k+')===true',
eq(Object.equals(new wrappers[k], new wrappers[k]), true));
});
it('Object.is(new Date(0),new Date(0)) === false',
eq(Object.is(new Date(0),new Date(0)), false));
it('Object.equals(new Date(0),new Date(0)) === true',
eq(Object.equals(new Date(0),new Date(0)), true));
it('Object.is(/./,/./) === false',
eq(Object.is(/./,/./), false));
it('Object.equals(/./, /./) === true',
eq(Object.equals(/./,/./), true));
// complex objects
var x = {'':[{undefined:[{0:0}]}]}, y = {'':[{undefined:[{0:false}]}]};
it('Object.is('+jsonStr(x)+','+jsonStr(y)+') === false',
eq(Object.is(x, y), false));
it('Object.equals('+jsonStr(x)+','+jsonStr(y)+') === true',
eq(Object.equals(x, y), false));
x[''][0]['undefined'][0][0] = false;
it('Object.equals('+jsonStr(x)+','+jsonStr(y)+') === true',
eq(Object.equals(x, y), true));
// descriptors
'enumerable configurable writable'.split(' ').forEach(function(d){
var dx, dy;
dx = Object.getOwnPropertyDescriptor(x, '');
dx[d] = false;
Object.defineProperty(x, '', dx);
it('Object.equals() // different ' + d,
eq(Object.equals(x, y), false));
it('Object.equals(...{descriptors:false}) // different ' + d,
eq(Object.equals(x, y, {descriptors:false}), true));
dy = Object.getOwnPropertyDescriptor(y, '');
dy[d] = false;
Object.defineProperty(y, '', dy);
it('Object.equals() // same ' + d,
eq(Object.equals(x, y), true));
});
// extensibility
x = {0:1}, y = {0:1};
'preventExtensions seal freeze'.split(' ').forEach(function(method){
Object[method](x);
it('Object.equals(x, y) // Object.' + method + '(x)',
eq(Object.equals(x, y), false));
it('Object.equals(x, y, {extensibility:false}) // Object.'
+ method + '(x)',
eq(Object.equals(x, y, {extensibility:false}), true));
Object[method](y);
it('Object.equals(x, y) // Object.' + method + '(y)',
eq(Object.equals(x, y), true));
});
x = {0:1}, y = {0:1};
Object.defineProperty(x, '1', {value:1});
it('Object.equals(x, y, {enumerator:Object.keys}) // hidden prop.',
ok(Object.equals(x,y) === false
&& Object.equals(x, y, {enumerator:Object.keys}) === true));
// filter
x = {0:1, __id__:'x'}, y = {0:1,__id__:'y'};
it('Object.equals(x, y, {filter:function(){...}}) // hidden prop.',
ok(Object.equals(x,y) === false
&& Object.equals(x, y, {
filter:function(d, k, o){ return !k.match(/^__/) }
}) === true));
});
describe('Object.clone', function () {
var src, jsrc, dst, err;
falsies.forEach(function(v) {
var jv = jsonStr(v);
it('Object.clone('+jv+') === ' + jv,
ok(Object.is(Object.clone(v), v)));
});
[[],{}].forEach(function(v) {
var jv = jsonStr(v);
var c = Object.clone(v);
it('Object.isnt(Object.clone('+jv+'),' + jv + ')',
ok(Object.isnt(c, v)));
it('Object.equals(Object.clone('+jv+'),' + jv + ')',
ok(Object.equals(c, v)));
});
// wrapper objects
Object.keys(wrappers).forEach(function(k) {
var src = new wrappers[k];
var dst = Object.clone(src, true);
it('Object.isnt(Object.clone(new '+k+', true), new ' +k+')',
ok(Object.isnt(dst, src)));
it('Object.equals(Object.clone(new '+k+' true), new ' +k+')',
ok(Object.equals(dst, src)));
});
src = new Date(0);
dst = Object.clone(src, true);
it('Object.isnt(Object.clone(new Date(0)),new Date(0))',
ok(Object.isnt(dst, src)));
it('Object.isnt(Object.clone(new Date(0)),new Date(0))',
ok(Object.equals(dst, src)));
src = /./;
dst = Object.clone(src, true);
it('Object.isnt(Object.clone(/./),/./)',
ok(Object.isnt(dst, src)));
it('Object.isnt(Object.clone(/./),/./)',
ok(Object.equals(dst, src)));
// complex objects
src = {'':[{undefined:[{0:0}]}]};
jsrc = jsonStr(src);
dst = Object.clone(src, true);
it('Object.isnt(Object.clone('+jsrc+'),' + jsrc + ')',
ok(Object.isnt(src, dst)));
it('Object.equals(Object.clone('+jsrc+'),' + jsrc + ')',
ok(Object.equals(src, dst)));
// descriptors
'enumerable configurable writable'.split(' ').forEach(function(d){
var dsrc;
dsrc = Object.getOwnPropertyDescriptor(src, '');
dsrc[d] = false;
Object.defineProperty(src, '', dsrc);
dst = Object.clone(src, true);
it('Object.clone(src, true) //' + d,
ok(Object.equals(src, dst)));
dst = Object.clone(src, true, {descriptors:false});
it('Object.clone(src, true, {descriptors:false}) //' + d,
ok(Object.equals(src, dst) === false
&& Object.equals(src, dst, {descriptors:false}) === true));
});
src = {'':[{undefined:[{0:0}]}]};
// extensibility
'preventExtensions seal freeze'.split(' ').forEach(function(method){
Object[method](src);
dst = Object.clone(src, true);
it('Object.clone() // Object.' + method + '(src)',
ok(Object.equals(src, dst)));
dst = Object.clone(src, true, {extensibility:false});
it('Object.clone(..., {extensibility:false}) // Object.'
+ method + '(src)',
ok(Object.equals(src, dst) === false
&& Object.equals(src, dst, {extensibility:false}) === true));
});
src = {'':[{undefined:[{0:0}]}]};
Object.defineProperty(src, 'x', {
get:function(){ return 'x=' + this._x },
set:function(v){ this._x = v }
});
dst = Object.clone(src, true);
dst.x = 'x';
it ('Object.clone() clones getter and setter', eq(dst.x, 'x=x'));
src = {0:1};
Object.defineProperty(src, '1', {value:1});
dst = Object.clone(src, true, {enumerator:Object.keys});
it('Object.clone(x, y, {enumerator:Object.keys}) // hidden prop.',
ok(Object.equals(dst, src) === false
&& Object.equals(dst, src, {enumerator:Object.keys}) === true));
// filter
src = {0:1,__id__:'src'};
var filter = function(d, k, o){ return !k.match(/^__/) };
dst = Object.clone(src, true, {filter:filter});
it('Object.clone(x, y, {filter:function(){...}})',
ok(Object.equals(dst, src) === false
&& Object.equals(dst, src, {filter:filter}) === true));
// exception
try {
err = '';
src = new Error;
dst = Object.clone(src);
} catch(e) {
err = e;
}
it('Object.clone(new Error)', ok(err));
// custom object
var Point = function(x, y) {
if (!(this instanceof Point)) return new Point(x, y);
this.x = x*1;
this.y = y*1;
};
Point.prototype = {
distance: function(pt) {
if (!pt) pt = Point(0,0);
var dx = this.x - pt.x;
var dy = this.y - pt.y;
return Math.sqrt(dx*dx + dy*dy);
}
};
src = Point(3,4);
dst = Object.clone(src, true);
it ('Object.clone() // custom obj', ok(Object.isnt(src, dst)));
it ('Object.clone() // custom obj', eq(dst.distance(Point(0,0)), 5));
});
Function.prototype.toJSON = function(){ return '(' + this + ')' };
Date.prototype.toJSON = function(){ return '(new Date(' + this*1 + '))' };
RegExp.prototype.toJSON = function(){ return ''+this };
var asStr = function(o){
if (o === null || o === void(0)) return '' + o;
var jstr = JSON.stringify(o);
return typeof o !== 'string'
? jstr.replace(/^\"/,'').replace(/\"$/,'') : jstr;
};
describe('Prototypal', function() {
var thingies = [false, 0, '', function(){}, [], {}, new Date(0), /(?:)/];
thingies.forEach(function(v0) {
thingies.forEach(function(v1) {
it(asStr(v0)+'.is('+asStr(v1)+'); // '+ Object.is(v0,v1),
eq(v0.is(v1), Object.is(v0, v1)));
it(asStr(v0)+'.isnt('+asStr(v1)+'); // ' + Object.isnt(v0,v1),
eq(v0.isnt(v1), Object.isnt(v0,v1)));
it(asStr(v0)+'.equals('+asStr(v1)+') // ' + Object.equals(v0,v1),
eq(v0.equals(v1), Object.equals(v0,v1)));
});
});
[false, 0, '', function(){}].forEach(function(v) {
it(asStr(v) + '.clone(true).is(' + asStr(v) +');',
eq(v.clone().is(v), true));
});
[[], {}, new Date(0), /(?:)/].forEach(function(v) {
it(asStr(v) + '.clone(true).isnt(' + asStr(v) +');',
eq(v.clone(true).isnt(v), true));
it(asStr(v) + '.clone(true).equals(' + asStr(v) +');',
eq(v.clone(true).equals(v), true));
});
});
})(this);