function DocumentDistance() {
	var vm    = this;
	vm.vec1   = null;
	vm.vec2   = null;
	vm.text1  = null;
	vm.text2  = null;

	vm.setVector = function(text) {
		var obj = {};
		text.split(' ').map(function(w) {
			obj[w] = obj[w] ? obj[w] + 1 : 1;
		});
		return obj;
    }
	
	vm.getConsine = function(text1, text2) {
		vm.vec1 = vm.setVector(text1);
		vm.vec2 = vm.setVector(text2);
		var numerator    = 0;
		vm.intersection(vm.vec1, vm.vec2).map(function(word) {
			numerator =numerator + (vm.vec1[word] * vm.vec2[word]);
		});

		var denominator = Math.sqrt(vm.getSum(vm.vec1)) * Math.sqrt(vm.getSum(vm.vec2))

		return !denominator ? 0.0 : numerator / denominator;
    }

	vm.getSum = function(obj) {
		var sum = 0;
		for (x in obj) {
			sum = sum + obj[x]**2;
        }
		return sum;
	}

    vm.intersection = function(o1, o2) {
        return Object.keys(o1).filter({}.hasOwnProperty.bind(o2));
    }
}

var dd = new DocumentDistance(); 
dd.getConsine('This is a foo bar sentence', 'This sentence is similar to a foo bar sentence');