return new promise for api call code example
Example 1: javascript return promise
function doSomething() {
return new Promise((resolve, reject) => {
console.log("It is done.");
if (Math.random() > .5) {
resolve("SUCCESS")
} else {
reject("FAILURE")
}
})
}
const promise = doSomething();
promise.then(successCallback, failureCallback);
Example 2: return new Promise(res => {
new Promise((resolve, reject) => {
throw new Error("Whoops!");
}).catch(function(error) {
alert("The error is handled, continue normally");
}).then(() => alert("Next successful handler runs"));