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enhance #extend to allow taking multiple source objects.

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This is done in jquery, extjs, and others as well.

added tests, no docs
This commit is contained in:
Mike Frawley
2010-01-24 11:53:30 -06:00
committed by Jeremy Ashkenas
parent 8c6694c242
commit 4085b68be4
2 changed files with 15 additions and 7 deletions
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11
test/objects.js
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@@ -25,9 +25,14 @@ $(document).ready(function() {
}); });
test("objects: extend", function() { test("objects: extend", function() {
var source = {name : 'moe'}, dest = {age : 50}; var result;
_.extend(dest, source); equals(_.extend({}, {a:'b'}).a, 'b', 'can extend an object with the attributes of another');
equals(dest.name, 'moe', 'can extend an object with the attributes of another'); equals(_.extend({a:'x'}, {a:'b'}).a, 'b', 'properties in source override destination');
equals(_.extend({x:'x'}, {a:'b'}).x, 'x', 'properties not in source dont get overriden');
result = _.extend({x:'x'}, {a:'a'}, {b:'b'});
ok(_.isEqual(result, {x:'x', a:'a', b:'b'}), 'can extend from multiple source objects');
result = _.extend({x:'x'}, {a:'a', x:2}, {a:'b'});
ok(_.isEqual(result, {x:2, a:'b'}), 'extending from multiple source objects last property trumps');
}); });
test("objects: clone", function() { test("objects: clone", function() {

11
underscore.js
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@@ -432,10 +432,13 @@
return _.filter(_.keys(obj), function(key){ return _.isFunction(obj[key]); }).sort(); return _.filter(_.keys(obj), function(key){ return _.isFunction(obj[key]); }).sort();
}; };
// Extend a given object with all of the properties in a source object. // Extend a given object with all the properties in given object(s)
_.extend = function(destination, source) { _.extend = function(obj) {
for (var property in source) destination[property] = source[property]; var prop;
return destination; each(_.rest(arguments), function (source) {
for (prop in source) obj[prop] = source[prop];
});
return obj;
}; };
// Create a (shallow-cloned) duplicate of an object. // Create a (shallow-cloned) duplicate of an object.