1️⃣ What is the difference between var, let, and const?

• var: Function-scoped, value can be changed, hoisting possible.
• let: Block-scoped, value can be changed.
• const: Block-scoped, cannot be reassigned to new value.

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2️⃣ What is the spread operator (...)?

Used for spreading/unpacking an array. Example, [...issueArray, newIssue] creates a new list. Can be used to merge multiple arrays to a new one.

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3️⃣ What is the difference between map(), filter(), and forEach()?

• map(): Creates a new array of same length, every item of the given array can be transformed as needed using map().
• filter(): Gives a new array filtered out from a given array according to some condition.
• forEach(): Does something for every item of a given array, no returns.

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4️⃣ What is an arrow function?

A compact way to write functions using => syntax.

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5️⃣ What are template literals?

Surrounding strings in backticks (``), not quotes- are template literals. Mostly used for easier handling of long strings.