promiseMistakes

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Main Page → Exercises → JavaScript → Solve an Exercise

Language/Type: JavaScript Promises

Which of the following changes should NOT be made to the following code that uses promises, assuming that the intent is to run asynchronous functions f1, f2, f3, and f4 in that order?

f1().then(function(result) {
    f2(result)
    .then(newResult => f3(newResult));
}).then(() => f4());
// Forgot to terminate chain with a catch!

output
Add a catch at the end of the promise chain. Always have every function in the chain return a promise. Replace the code with Promise.all([f1, f2, f3, f4]) to run all four functions. Undo the unnecessary nesting of promises f2-f3 and flatten the code into a single promise chain. (order shuffled)

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promiseMistakes