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hei

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define(function(require) {

    var sinon = require('sinon');
    var _ = require('underscore');

    // fakeResponse
    // ------------
    //
    // High-level helper for responding equally to all Ajax requests.
    //

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define(function(require) {

    var View = require('base/view');
    var menuTemplate = require('hgn!./menu');

    var MenuView = View.extend({

        template: menuTemplate,

        initialize: function(options) {

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def getPagination(currentPage, totalNumberOfPages, beforeOrAfter = 2):
    start = max(1, currentPage - beforeOrAfter)
    stop = min(totalNumberOfPages, currentPage + beforeOrAfter)
    return range(start, stop + 1)

print getPagination(5, 6)
print getPagination(3, 6, 1)

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Transform your code from:

define(['backbone', './model', './mySync'], function(Backbone, Model, mySync) {

    var Collection = Backbone.Collection.extend({

        model: Model,
        sync: mySync

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// simpler render

render: function() {
  var els = _.map(this._views, function(subview) {
    return subview.render().el;
  });
  this.$el.empty().append(els);
}

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var Message = Backbone.Model.extend({

  parse: function(resp) {
    resp.replies = new Messages(resp.replies);
    return resp;
  },

  toJSON: function() {
    var attributes = _.clone(this.attributes);
    // evt: var attributes = Backbone.Model.prototype.toJSON.call(this)

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var events = _.clone(Backbone.Events);

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Uncaught TypeError: Cannot call method 'add' of undefined

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var events = _.clone(Backbone.Events);