Languages & Frameworks

JavaScript & TypeScript

6 practice questions. Free questions open a full answer guide; the rest unlock with Pro.

In JavaScript, how does async/await work, and how does it relate to Promises and callbacks? Junior level
In TypeScript, what's the difference between type and interface, and when would you choose one over the other?Go Pro Intern level
In TypeScript, what's the difference between the 'any' and 'unknown' types, and how does that change the way you handle data from an external API?Go Pro Mid level
In JavaScript, what's the difference between == and ===, and which should you reach for by default?Go Pro Intern level
In TypeScript, when do you use a 'type' alias versus an 'interface', and what does it mean that TypeScript is structurally typed?Go Pro Mid level
In TypeScript, what is the difference between the any and unknown types, and when would you use unknown?Go Pro Junior level

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