Javascript: setInterval example

setInterval.js

(function () {

    var speed = 500,
        i = 0,
        doSomething = function () {
            console.log('doSomething() executed ' + (i + 1) + ' times');
            i++;
        
            if (i > 4) {
                // stop when condition is met
                clearInterval(timer);
            }
        };
    
    // setInterval to call 'doSomething'
    // run every 500ms
    // add ID to 'timer'
    var timer = setInterval(doSomething, speed);

})();

setTimeout.js

(function () {
    
    var speed = 500,
        i = 0,
        doSomething = function () {
            console.log('doSomething() executed ' + (i + 1) + ' times');
            i++;
        };
    
    setTimeout(function() { 
        doSomething(); 
        setTimeout(function() { 
            doSomething(); 
            setTimeout(function() { 
                doSomething(); 
                setTimeout(function() { 
                    doSomething(); 
                    setTimeout(function() { 
                        doSomething(); 
                    }, speed);
                }, speed);
            }, speed);
        }, speed);
    }, speed);
    
})();

Output:

"doSomething() executed 1 times"
"doSomething() executed 2 times"
"doSomething() executed 3 times"
"doSomething() executed 4 times"
"doSomething() executed 5 times"