// IMPERATIVE STYLE
var input = [1, 3, 5];
var results = [];
for(var i=0; i<input.length; i++) {
   results.push(input[i] + 2);
}
alert(results.toSource()); // -> [3, 5, 7]

// FUNCTIONAL STYLE
var input = [1, 3, 5];
results = input.map(function(item) item + 2);
alert(results.toSource()); // -> [3, 5, 7]