"Promise.resolve" Code Answer's
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js create a promise
Yellowed Yacare
on Feb 18, 2020
/*
A Promise is a proxy for a value not necessarily known when the promise is created.
It allows you to associate handlers with an asynchronous action's eventual success
value or failure reason.
*/
let promise = new Promise((resolve , reject) => {
fetch("https://myAPI")
.then((res) => {
// successfully got data
resolve(res);
})
.catch((err) => {
// an error occured
reject(err);
});
});promise resolve reject
Ashamed Ape
on Mar 25, 2021
function testFunction(value) {
return new Promise(function (resoleve, reject) {
setTimeout(function () {
let n = value;
if (n < 100) {
resoleve("範囲内");
} else {
reject("範囲外");
}
}, 2000);
})
}
testFunction(10)
.then(function (value) {
console.log(value);
return testFunction(50);
})
.then(function (value) {
console.log(value);
return testFunction(150);
})
.catch(function (error) {
console.log(`エラーです。${error}`);
})
Source: noumenon-th.net
what is promise in javascript
Odd Ox
on Nov 29, 2020
Promises make async javascript easier as they are easy to use and write than callbacks. Basically , promise is just an object , that gives us either success of async opertion or failue of async operationsmaking promises in js
Blue-eyed Barracuda
on Jul 28, 2020
getData()
.then(data => console.log(data))
.catch(error => console.log(error));Source: scotch.io
promise resolve reject
Ashamed Ape
on Mar 25, 2021
function testFunction() {
return new Promise(function (resolve, reject) {
setTimeout(function () {
resolve('hello!');
}, 1000);
})
}
testFunction()
.then(function (value) {
console.log(value);
})
.catch(function (error) {
console.log(error);
})
Source: noumenon-th.net
Promise.resolve
Worrisome Willet
on May 01, 2021
var original = Promise.resolve(33);
original.then( val => console.log('origianl', val);
var cast = Promise.resolve(original);
cast.then(function(value) {
console.log('value: ' + value);
});
console.log('original === cast ? ' + (original === cast));
// logs, in order:
// original === cast ? true
// value: 33
Source: developer.mozilla.org
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