range

gistfile1.js

function range(start, end, step) {
    step = Math.floor(Math.abs(step)) || 1;
    if (typeof end == 'undefined') {
        end = start; 
        start = 0;         
    }
    else if (start > end) {
        var s = start;
        start = end;
        end = s;
    }
    
    return function (fn) {
        for (var i = start; i < end; i += step) {
            fn(i);
        }
    };                           
}


//Examples
range(10)(function (x) {
    console.log(x); // 0..9
});

range(10, 20)(function (x) {
    console.log(x); // 10..19
});

range(10, 20, 2)(function (x) {
    console.log(x); // 10, 12 .. 18
});