I don't understand why the first setTimeout function works but the second one doesn't. The first one is commented out when I run the second setTimeout. But instead of resolving after 3 seconds it resolves immediately.
I'm new to the whole 'promise' thing and the tutorial I'm working through uses promises with setTimeout a lot.
let promise = new Promise( ( resolve, reject ) => {
/* why does setTimeout work with this one... */
setTimeout( () => resolve( 'Job\'s done!!!' ), 3000 );
/* but not with this one */
setTimeout( resolve('done'), 3000 );
} );
promise.then(
result => alert( result )
);
/* why does setTimeout work with this one... */
setTimeout( () => resolve( 'Job\'s done!!!' ), 3000 );
when the timeout occur you call a function () => ...
wich when executed till resolve the promise
/* but not with this one */
setTimeout( resolve('done'), 3000 );
here you actually resolve the promise (you execute the result function) and pass the result to the setTimeout function.
Writing
() => resolve( 'Job\'s done!!!' )
is the same as
function() {
resolve( 'Job\'s done!!!' );
}