"promise resolve reject" 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);
});
});javascript promise
Grepper
on Jul 01, 2019
var promise = new Promise(function(resolve, reject) {
// do some long running async thing…
if (/* everything turned out fine */) {
resolve("Stuff worked!");
}
else {
reject(Error("It broke"));
}
});
//usage
promise.then(
function(result) { /* handle a successful result */ },
function(error) { /* handle an error */ }
);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。${error}`);
})
Source: noumenon-th.net
js promise examples
Apoplectic Android
on Apr 01, 2020
//Promise to load a file...
//use with openFile(url, fCallback);
//fCallback(fileContents){ //do something with fileContents}
const loadFile = url => {
return new Promise(function(resolve, reject) {
//Open a new XHR
var request = new XMLHttpRequest();
request.open('GET', url);
// When the request loads, check whether it was successful
request.onload = function() {
if (request.status === 200) {
// If successful, resolve the promise
resolve(request.response);
} else {
// Otherwise, reject the promise
reject(Error('An error occurred while loading image. error code:' + request.statusText));
}
};
request.send();
});
};
const openFile = (url, processor) => {
loadFile(url).then(function(result) {
processor(result);
},
function(err) {
console.log(err);
});
};promise resolve reject
Ashamed Ape
on Mar 25, 2021
function testFunction() {
return new Promise(function (resolve, reject) {
setTimeout(function () {
resolve('hello!');
}, 1000);
})
}
testFunction()
.then(function (value) {
console.log(value);
})
.catch(function (error) {
console.log(error);
})
Source: noumenon-th.net
promise resolve reject
Ashamed Ape
on Mar 25, 2021
function testFunction(value) {
return new Promise(function (resoleve, reject) {
setTimeout(function () {
let n = value;
if(n<100){
resoleve("範囲内");
}else{
reject("範囲外");
}
}, 2000);
})
}
testFunction(1000)
.then(function (value) {
console.log(value);
})
.catch(function(error){
console.log(`エラーです。${error}`);
})
Source: noumenon-th.net
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