Use case of promises
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// my own asynchronous function
function pranav(cb) {
console.log("in the pranavfunction");
setTimeout(function(){
cb("This is a callback function");
},1000)
}
function logIt(data) {
console.log(data)
}
pranav(logIt);
//Promises
//just the sintactical sugar for the callback
//no need of callbacks
//but works by callbacks under the hood
function pranav() {
return new Promise(function(resolve) {
setTimeout(function() {
resolve("this returns by the promise");
},1000)
})
}
function logIt(data) {
console.log(data)
}
console.log("before promise")
pranav().then(logIt);
console.log("after promise")
JavaScript
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