promp node js
const readline = require("readline");
const rl = readline.createInterface({
input: process.stdin,
output: process.stdout
});
rl.question("What is your name ? ", function saveInput(name) {
console.log(`His name is ${name}`);
rl.close();
});
rl.on("close", function saveInput() {
console.log("\nBYE BYE !!!");
process.exit(0);
});javascript promises
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 javascript
/*
Promise is a constructor function, so you need to use the new keyword to
create one. It takes a function, as its argument, with two parameters -
resolve and reject. These are methods used to determine the outcome of the
promise.
The syntax looks like this:
*/
const myPromise = new Promise((resolve, reject) => {
});promise js
//example
function tetheredGetNumber(resolve, reject) {
try {
setTimeout(
function() {
const randomInt = Date.now();
const value = randomInt % 10;
try {
if(value >= THRESHOLD_A) {
throw new Error(`Too large: ${value}`);
}
} catch(msg) {
reject(`Error in callback ${msg}`);
}
resolve(value);
return;
}, 500);
} catch(err) {
reject(`Error during setup: ${err}`);
}
return;
}Copyright © 2021 Codeinu
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