asynchronizacja i oczekiwanie
// In JavaScript, An async function is a function declared with the async keyword, and the await keyword can then be permitted within it.
// Example;
function resolveAfter2Seconds() {
return new Promise(resolve => {
setTimeout(() => {
resolve('resolved');
}, 2000);
});
}
async function asyncCall() {
console.log('calling');
const result = await resolveAfter2Seconds();
console.log(result);
// expected output: "resolved"
}
asyncCall();
// The asnycCall function when run will wait for the await block which calls resolveAfter2Seconds() before it logs the output to the console.
// We can also use the then method to wait for an async call before running another block of code.
// Example;
async function resolveAfter2Seconds() {
return new Promise(resolve => {
setTimeout(() => {
resolve('resolved');
}, 2000);
});
}
resolveAfter2Seconds().then(
function(result){console.log(result)}
function(error){console.log(result)}
);
// There are so many other ways of writing asychronous functions in javascript.
// Javascript is itself an asychronous language.
Chukwujiobi Canon
