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POWhere do I need a closure for this one?
 

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  1. POWhere do I need a closure for this one?
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    <p>I have this constructor:</p> <pre><code>var EditableItem = (function() { function EditableItem(schema, item) { this.schema = _.clone(schema); this.item = _.clone(item); this.propertyTypes = [ 'stringProperties', 'booleanProperties']; } EditableItem.prototype = { createItem: function() { var self = this; self.propertyTypes.forEach(function(type) { var properties = self.schema[type]; properties.forEach(function(property, i) { var itemProperty = self.item[type][property.id]; if (itemProperty) { properties[i].value = itemProperty; } }); }); self.schema.itemId = self.item._id; return self.schema; } }; return EditableItem; })(); </code></pre> <p>and each time I use it, like this...</p> <pre><code>async.parallel({ schema: function(callback) { schemas().findOne({ _id: 'default' }, callback); }, items: function(callback) { items().find().toArray(callback); } }, function(err, result) { if (err) return callback(err); var all = result.items.map(function(item) { return new EditableItem(result.schema, item).createItem(); }); callback(null, all); }); </code></pre> <p>...I end up with an array <code>result</code> where the last item is repeated while the others are omitted.</p> <p>My guess is that I need to add a closure somewhere, and as you can see I've tried, but still it yields the same result. Any ideas?</p> <p><strong>EDIT:</strong> I've found a solution. It's not pretty, but maybe someone here can explain why it works and offer a better solution...</p> <p>In the constructor, where I had: this.schema = _.clone(schema);</p> <p>I changed to: this.schema = JSON.parse(JSON.stringify(schema));</p> <p>This seems to allocate new memory for the object, while _.clone still keeps some references to the original object (I guess).</p>
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    1. PO
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      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. USMickel
    1. USMickel
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    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
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    1. VO
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      1. POWhere do I need a closure for this one?
      1. This table or related slice is empty.
      1. VTDownMod
    1. COPlain objects don't have a `.map()` method. Even so, there's no reason to have another function inside your `.map()` callback. You already have a unique variable scope per `item`.
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      1. POWhere do I need a closure for this one?
      1. This table or related slice is empty.
    2. COMaybe because you have an extra `)` at the end of your inner closure? - `})(schema, item));`
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      1. POWhere do I need a closure for this one?
      1. USIan
    3. COAnd extra closure on 'var EditableItem = (...)();' ...
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      1. POWhere do I need a closure for this one?
      1. USNenad
 

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