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Backbone.js: `extend` undefined?

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By User



Just getting started with Backbone.js. Simply including Backbone (either dev/production versions) causes the error:





Uncaught TypeError: Cannot call method 'extend' of undefined on Line 128:





// Attach all inheritable methods to the Model prototype. _.extend(Backbone.Model.prototype, Backbone.Events, {



Source: Tips4all
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  1. Tips For AllApril 9, 2012 at 3:38 AM

    The issue was that I wan't loading underscore.js. I totally missed that dependency in the docs. Duh.

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