31 lines
942 B
Plaintext
31 lines
942 B
Plaintext
When using the Backbone.js framework with model ``++defaults++`` that contain arrays or objects, ``++defaults++`` should be defined as a function rather than an object. This is because objects and arrays are passed by reference in JavaScript. So a ``++defaults++`` object that contains arrays or objects is going to set the default value of every instance to point to the same shared object or array.
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Use a function instead and a fresh copy of the object or array will be peeled off for each instance.
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== Noncompliant Code Example
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----
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var Person = Backbone.Model.extend({
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defaults: { // Noncompliant; every instance of Person will share the same instance of favoriteColors
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favoriteColors: ["blue","purple","raspberry"]
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}
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});
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----
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== Compliant Solution
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----
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var Person = Backbone.Model.extend({
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defaults: function() {
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return {
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favoriteColors: ["blue","purple","raspberry"]
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};
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}
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});
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----
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