test.js

function createOperations(){
	var operations = [];
	for (var i = 0; i < 5; i++) {
		operations.push(function(input){
			return input * i;
		})
	}
	return operations;
}

var ops = createOperations();
for (var i = 0; i < 5; i++) {            
      		alert(ops[i](i));
}