bicycle.js

var simMath = {
	memo:{},
	operation:function(array, method){
		return Array.prototype.join.call(array, method);
	},
	calculate:function(array, method){
		return Array.prototype.reduce.call(array, method);
	},
	plus: function(){
		var operation = this.operation(arguments, '+');
		if(operation in this.memo)
			return this.memo[operation];
		var result = this.calculate(arguments, function(a,b){return a+b});
		this.memo[operation] = Number(result);
		return result; 
	},
	minus: function(){
		var operation = this.operation(arguments, '-');
		if(operation in this.memo)
			return this.memo[operation];
		var result = this.calculate(arguments, function(a,b){return a-b});
		this.memo[operation] = Number(result);
		return result; 
	},
	multiply: function(){
		var operation = this.operation(arguments, '*');
		if(operation in this.memo)
			return this.memo[operation];
		var result = this.calculate(arguments, function(a,b){return a*b});
		this.memo[operation] = Number(result);
		return result; 
	},
	devide: function(){
		var operation = this.operation(arguments, '/');
		if(operation in this.memo)
			return this.memo[operation];
		var result = this.calculate(arguments, function(a,b){return a/b});
		this.memo[operation] = Number(result);
		return result; 
	},
}