TechFerry Interview Questions and Answers

Basic node js and sql questions

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Q1. How can you make parallel API calls in JavaScript?
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You can make parallel API calls in JavaScript using Promises, async/await, and libraries like Axios.
• Use Promise.all() to execute multiple promises concurrently.

• Example: Promise.all([fetch(url1), fetch(url2)]).then(responses => { /* handle responses */ });

• Utilize async/await for cleaner syntax: const responses = await Promise.all([fetch(url1), fetch(url2)]);

• Consider using Axios for easier handling of multiple request...read more
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Q2. What is the difference between Promise.all and Promise.race in JavaScript?
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Promise.all waits for all promises to resolve, while Promise.race resolves as soon as the first promise resolves or rejects.
• Promise.all takes an array of promises and returns a single promise that resolves when all of the promises have resolved.

• Example: Promise.all([Promise.resolve(1), Promise.resolve(2)]) resolves to [1, 2].

• If any promise in Promise.all rejects, the entire promise is rejected with that reason.

• Promise....read more
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