Changing the interval of SetInterval while it's running

Question

I have written a javascript function that uses setInterval to manipulate a string every tenth of a second for a certain number of iterations.

function timer(         


        

Answer 1

I'm a beginner in javascript, and didn't found any help in the previous answers (but many good ideas).
This piece of code below accelerates (acceleration > 1) or decelerates (acceleration <1). I hope it might help some people:

function accelerate(yourfunction, timer, refresh, acceleration) {
    var new_timer = timer / acceleration;
    var refresh_init = refresh;//save this user defined value
    if (refresh < new_timer ){//avoid reseting the interval before it has produced anything.
        refresh = new_timer + 1 ;
    };
    var lastInter = setInterval(yourfunction, new_timer);
    console.log("timer:", new_timer);
    function stopLastInter() {
        clearInterval(lastInter);
        accelerate(yourfunction, new_timer, refresh_init, acceleration);
        console.log("refresh:", refresh);
    };
    setTimeout(stopLastInter, refresh);
}

With :

• timer: the setInterval initial value in ms (increasing or decreasing)
• refresh: the time before a new value of timer is calculated. This is the step lenght
• factor: the gap between the old and the next timer value. This is the step height