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Added util.clone(); does not yet support deep cloning

closure/master
Mike Gerwitz 2010-12-16 23:15:42 -05:00
parent a2c894b6bb
commit 6efaba7fc5
2 changed files with 100 additions and 0 deletions

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@ -85,6 +85,41 @@ exports.defineSecureProp = function( obj, prop, value )
} }
/**
* Clones an object
*
* @param {Object} data object to clone
*
* @return {Object} cloned object
*/
exports.clone = function( data )
{
if ( data instanceof Array )
{
// return a copy of the array
return data.slice( 0 );
}
else if ( data instanceof Object )
{
var newobj = {};
// copy data to the new object
for ( prop in data )
{
if ( data.hasOwnProperty( prop ) )
{
newobj[ prop ] = data[ prop ];
}
}
return newobj;
}
// primitive type; cloning unnecessary
return data;
};
/** /**
* Parses object properties to determine how they should be interpreted in an * Parses object properties to determine how they should be interpreted in an
* Object Oriented manner * Object Oriented manner

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@ -0,0 +1,65 @@
/**
* Tests util.clone
*
* Copyright (C) 2010 Mike Gerwitz
*
* This file is part of ease.js.
*
* ease.js is free software: you can redistribute it and/or modify it under the
* terms of the GNU Lesser General Public License as published by the Free
* Software Foundation, either version 3 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
* for more details.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
* @author Mike Gerwitz
* @package test
*/
require( './common' );
var assert = require( 'assert' ),
util = require( '../lib/util' );
var arr = [ 1, 2, 3 ],
obj = { a: 1, b: 2 };
var arr2 = util.clone( arr ),
obj2 = util.clone( obj );
assert.ok(
( arr !== arr2 ),
"Cloned array is not the same object as the original"
);
assert.ok(
( obj !== obj2 ),
"Cloned object is not the same object as the original"
);
// ensure array was properly cloned
for ( var i = 0, len = arr.length; i < len; i++ )
{
assert.equal(
arr2[ i ],
arr[ i ],
"Array data is properly cloned"
);
}
// ensure object was properly cloned
for ( prop in obj )
{
assert.equal(
obj2[ prop ],
obj[ prop ],
"Object data is properly cloned"
);
}