javascript/callback.js at master · reenakesavan/javascript · GitHub

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// callback
function orderfood(input)
{
    setTimeout(() => {
        console.log("ordered food is done");
        input()
    }, 3000);
}

function eatfood()
{
    setTimeout(() => {
        console.log("eat food is done");

    }, 2000);
}

orderfood(eatfood)  // callback is used to call one function call as parameter of other function to covert 2 function in syncronous

// callbackhell

function brush (b)
{
    setTimeout(() => {
        console.log("time take for brush is 2000");
        b()
    }, 2000);
}
function bath (a)
{
    setTimeout(() => {
        console.log("time take for bath is 2000");
        a()
    }, 2500);
}
function ready (c)
{
    setTimeout(() => {
        console.log("time take for ready is 1500");
        c()
    }, 1500);
}
function relax (d)
{
    setTimeout(() => {
        console.log("time take for relax is 500");
        d()
    }, 500);
}
function eat ()
{
    setTimeout(() => {
        console.log("time take for eat is 2500");

    }, 2500);
}


brush()
bath()
ready()
relax()
eat()
/*brush(()=>{
    bath(()=>{
        ready(()=>{
            relax(eat)
        })
    })

})*/