What is promise chaining in TypeScript?

What is promise chaining in TypeScript?

Promise chaining in TypeScript allows you to execute asynchronous operations in sequence, where each operation waits for the previous one to complete.

Can you give me an example of promise chaining?

Sure! Here's a simple example:

function fetchData(): Promise<string> {
    return new Promise((resolve) => {
        setTimeout(() => resolve('Data fetched!'), 1000);
    });
}

fetchData()
    .then(data => {
        console.log(data);
        return 'Next step';
    })
    .then(next => {
        console.log(next);
    });

What happens if one of the promises fails?

If a promise in the chain fails, the control jumps to the nearest .catch() block, allowing you to handle the error gracefully.

How can I handle multiple promises at once?

You can use Promise.all() to handle multiple promises concurrently. It waits for all promises to resolve or for one to reject.