difference between callback and promise

What is Callback Hell?

June 27, 2019July 17, 2019 Pradeep Maurya

addition(2,function(addRes,err){ if(!err){ Subtract(addRes,function(subRes,err){ if(!err){ multiplication(subRes,function(mulRes,err){ console.log(mulRes); }); } }); } }); function addition(val,callback){ callback(val+5,false); } function Subtract(val,callback){ callback(val-3,false); } function multiplication(val,callback){ callback(val*5,false); } In the above code, there is three operation addition, Subtract and multiplication. Which is using a callback…

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Basic Difference Between Callback and Promise

June 25, 2019November 29, 2019 Pradeep Maurya

Callback: A Callback is a function that we call inside another function. A callback may or may not performed asynchronously. Normally callback runs after the parent function completes its operation. function calculate(x) { return x+2; } function display(y) { //execute…

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