set.js

function Set() {
	this.dataStore = [];
	this.add = add;
	this.remove = remove;
	this.size = size;
	this.union = union;
	this.intersect = intersect;
	this.subset = subset;
	this.difference = difference;
	this.show = show;
}

function add(data) {
	if (this.dataStore.indexOf(data) < 0) {
		this.dataStore.push(data);
		return true;
	}
	else {
		return false;
	}
}

function remove(data) {
	var pos = this.dataStore.indexOf(data);
	if (pos > -1) {
		this.dataStore.splice(pos,1);
		return true;
	}
	else {
		return false;
	}
}

function show() {
	return this.dataStore;
}

function contains(data) {
	if (this.dataStore.indexOf(data) > -1) {
	return true;
	}
	else {
		return false;
	}
}

function union(set) {
	var tempSet = new Set();
	for (var i = 0; i < this.dataStore.length; ++i) {
		tempSet.add(this.dataStore[i]);
	}
	for (var i = 0; i < set.dataStore.length; ++i) {
		if (!tempSet.contains(set.dataStore[i])) {
			tempSet.dataStore.push(set.dataStore[i]);
		}
	}
	return tempSet;
}

function intersect(set) {
	var tempSet = new Set();
	for (var i = 0; i < this.dataStore.length; ++i) {
		if (set.contains(this.dataStore[i])) {
			tempSet.add(this.dataStore[i]);
		}
	}
	return tempSet;
}

function subset(set) {
	if (this.size() > set.size()) {
		return false;
	}
	else {
		// foreach (var member in this.dataStore) {
		// 	if (!set.contains(member)) {
		// 		return false;
		// 	}
		// }
	}
	return true;
}

function size() {
	return this.dataStore.length;
}

function difference(set) {
	var tempSet = new Set();
	for (var i = 0; i < this.dataStore.length; ++i) {
		if (!set.contains(this.dataStore[i])) {
			tempSet.add(this.dataStore[i]);
		}
	}
	return tempSet;
}