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adding an initial implementation of a 'pick' function. #523

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Jeremy Ashkenas
2012-04-02 15:01:26 -04:00
parent 4fa0a9f4d5
commit 719cd24aa9
3 changed files with 18 additions and 20 deletions
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13
index.html
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@@ -214,6 +214,7 @@
<li>- <a href="#values">values</a></li>
<li>- <a href="#object-functions">functions</a></li>
<li>- <a href="#extend">extend</a></li>
<li>- <a href="#pick">pick</a></li>
<li>- <a href="#defaults">defaults</a></li>
<li>- <a href="#clone">clone</a></li>
<li>- <a href="#tap">tap</a></li>
@@ -1016,16 +1017,14 @@ _.extend({name : 'moe'}, {age : 50});
=&gt; {name : 'moe', age : 50}
</pre>
<p id="restrict">
<b class="header">restrict</b><code>_.restrict(source, *keys)</code>
<p id="pick">
<b class="header">pick</b><code>_.pick(object, *keys)</code>
<br />
Return a clone of the <b>source</b> with only the properties with the
property names, or arrays of property names, provided in <b>keys</b>.
Return a copy of the <b>object</b>, filtered to only have values for
the whitelisted <b>keys</b> (or array of valid keys).
</p>
<pre>
_.restrict({name : 'moe', age: 50, userid : 'moe1'}, 'name', 'age');
=&gt; {name : 'moe', age : 50}
_.restrict({name : 'moe', age: 50, userid : 'moe1'}, ['name', 'age']);
_.pick({name : 'moe', age: 50, userid : 'moe1'}, 'name', 'age');
=&gt; {name : 'moe', age : 50}
</pre>

12
test/objects.js
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@@ -41,13 +41,13 @@ $(document).ready(function() {
equal(_.keys(result).join(''), 'ab', 'extend does not copy undefined values');
});
test("objects: restrict", function() {
test("objects: pick", function() {
var result;
result = _.restrict({a:1, b:2, c:3}, 'a', 'c');
result = _.pick({a:1, b:2, c:3}, 'a', 'c');
ok(_.isEqual(result, {a:1, c:3}), 'can restrict properties to those named');
result = _.restrict({a:1, b:2, c:3}, ['b', 'c']);
result = _.pick({a:1, b:2, c:3}, ['b', 'c']);
ok(_.isEqual(result, {b:2, c:3}), 'can restrict properties to those named in an array');
result = _.restrict({a:1, b:2, c:3}, ['a'], 'b');
result = _.pick({a:1, b:2, c:3}, ['a'], 'b');
ok(_.isEqual(result, {a:1, b:2}), 'can restrict properties to those named in mixed args');
});
@@ -178,7 +178,7 @@ $(document).ready(function() {
// Arrays with primitive and object values.
ok(_.isEqual([1, "Larry", true], [1, "Larry", true]), "Arrays containing identical primitives are equal");
ok(_.isEqual([/Moe/g, new Date(2009, 9, 25)], [/Moe/g, new Date(2009, 9, 25)]), "Arrays containing equivalent elements are equal");
ok(_.isEqual([(/Moe/g), new Date(2009, 9, 25)], [(/Moe/g), new Date(2009, 9, 25)]), "Arrays containing equivalent elements are equal");
// Multi-dimensional arrays.
var a = [new Number(47), false, "Larry", /Moe/, new Date(2009, 11, 13), ['running', 'biking', new String('programming')], {a: 47}];
@@ -346,7 +346,7 @@ $(document).ready(function() {
Date.prototype.isEqual = function(that) {
var this_date_components = this.toJSON();
var that_date_components = (that instanceof Date) ? that.toJSON() : that;
delete this_date_components['_type']; delete that_date_components['_type']
delete this_date_components['_type']; delete that_date_components['_type'];
return _.isEqual(this_date_components, that_date_components);
};

13
underscore.js
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@@ -648,14 +648,13 @@
return obj;
};
// Restrict a given object to the properties named
_.restrict = function(obj) {
if (obj !== Object(obj)) throw new TypeError('Invalid object');
var dest = {};
each(_.flatten(slice.call(arguments, 1)), function(prop) {
if (prop in obj) dest[prop] = obj[prop];
// Return a copy of the object only containing the whitelisted properties.
_.pick = function(obj) {
var result = {};
each(_.flatten(slice.call(arguments, 1)), function(key) {
if (key in obj) result[key] = obj[key];
});
return dest;
return result;
};
// Fill in a given object with default properties.