what is the difference between these snippets?:

constructor: function(config) {
    this.initConfig(config);
}

constructor: function(config) {
    this.callParent(arguments);
}

constructor: function(config) {
    this.superclass.constructor.call(this, config);
}

AND, how does it differ to be overriding OTHER methods than constructor?

model-view-controller extjs
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