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Node.js Functions - Promises
Promises are a more advanced form of asynchronous programming in Node.js. Promises represent the eventual completion (or failure) of an asynchronous operation and allow us to write asynchronous code in a more synchronous style.
function add(a, b) {
return new Promise(function(resolve, reject) {
const sum = a + b;
if (sum >= 0) {
resolve(sum);
} else {
reject("Sum is negative");
}
});
}
add(2, 3)
.then(function(result) {
console.log(result); // prints 5
})
.catch(function(error) {
console.error(error); // prints "Sum is negative"
});Async/Await
Async/await is a newer feature of Node.js that allows us to write asynchronous code in a more synchronous style. Async/await is built on top of promises and provides a more concise and readable syntax for handling asynchronous operations.
async function add(a, b) {
const sum = a + b;
if (sum >= 0) {
return sum;
} else {
throw new Error("Sum is negative");
}
}
async function main() {
try {
const result = await add(2, 3);
console.log(result); // prints 5
} catch (error) {
console.error(error); // prints "Sum is negative"
}
}
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