Consider the following function assignment:
var EventEmitter = require("events").EventEmitter;
EventEmitter.prototype.once = function(type, callback) { var that = this;
this.on(type, function listener() {
that.removeListener(type, listener);
callback.apply(that, arguments);
}); };
Also consider the following two variables:
var a = new EventEmitter
var b = new EventEmitter.prototype
Does the `this` on line 5 of the first code section refer to variables a,
b, or both? Is variable b even declared legally?
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