README.md

Callback hell - Pyramid of Doom

Callback hell is a phenomenon where a callback is called inside another callback. it is nesting of multiple callback with in a function. it is also reffered as "Pyramid of Doom".

Example:

function print(i){
   window.alert("This is call number", i);
};

function fun1(callback) {
   setTimeout(() => {
      let i = 1;
      callback(i);
      i++;
      
      setTimeout(() => {
         callback(i);
         i++;

         setTimeout(() => {
            callback(i);
            i++;

            setTimeout(() => {
               callback(i);
               i++;

               setTimeout(() => {
                  callback(i);
                  i++;
               }, 800);
            }, 700);
         }, 500);
      }, 300);
   }, 100);
};

fun1(print);