stubbed out problems TODO.

README.md

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 # programming-problems
+
 Solutions for various programming problems

eventEmitter.js

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+/*
+Event Emitter
+
+an event emitter is responsible for managing a set of listeners and publishing events to them when it is told such events happened
+used in async event driven architecture
+
+API:
+	addListener
+	removeListener
+	removeAllListeners
+	emit
+	once
+	listeners
+
+http://learnjswith.me/build-an-event-emitter-in-javascript/
+*/
+
+
+
+const emitor = new Emitor();
+
+const callback = function(x, y) {console.log(x + y)}
+const sub = emitor.subscribe('event_1', callback);
+
+sub.emit('event_1')

facebook.js

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+// implement a method to effieciently exlude items from the items array, as outlined in the exlude array.
+
+const items = [
+	{type: 'computer', color: 'green', flavor: 'apple'},
+	{type: 'cellphone', color: 'gold', flavor: 'orange'},
+	{type: 'computer', color: 'silver', flavor: 'grape'},
+]
+
+const exclude = [
+	{k: 'type', v: 'cellphone'},
+	{k: 'color', v: 'silver'},
+];

iterator.js

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+/*
+	Implement an Iterator of Iterators which traverses through  an arbitrary number of iterators. IE, an iterator which iterates over three list iterators in the following way:
+	
+	L1 = a1, a2, a3
+	L2 = b1, b2, b3
+	L3 = c1, c2, c3
+
+	Then the iterator should process them in this order:
+	a1, b1, c1, a2, b2, c2, a3, b3, c3
+*/