Question 1

How do you implement a linked list?

Accepted Answer

A linked list uses nodes with values and pointers to the next node. You create a class for nodes and link them manually. I use it for dynamic data when arrays aren’t ideal.

Question 2

How do you format a number as currency?

Accepted Answer

Use `Intl.NumberFormat` to format numbers as currency with locale options—it’s built-in and flexible. You specify the currency and style. I use it for polished UI outputs.

Question 3

What are tagged template literals?

Accepted Answer

Tagged template literals let a function process a template literal by passing strings and expressions separately. It’s cool for custom string handling—like sanitizing or styling. I use it for creative formatting.

Question 4

How do you implement a factorial function?

Accepted Answer

A factorial function multiplies a number by all positive integers below it—like `5! = 5 * 4 * 3 * 2 * 1`. You can use recursion or a loop; I prefer recursion for clarity, memoizing if performance matters.

Question 5

How do you create a module in JavaScript?

Accepted Answer

With ES6, you use `export` to define a module and `import` to use it. It keeps code organized and reusable. I prefer modules over old-school IIFEs for cleaner dependency management.

Question 6

What is a closure and how is it useful?

Accepted Answer

A closure lets a function access variables from its outer scope even after that scope has closed. It’s like a memory that sticks around. I use it for private variables or counters—it’s a neat way to keep state without globals.

Question 7

How do you generate a random number in JavaScript?

Accepted Answer

Use `Math.random()` for a number between 0 and 1, then scale it—like `Math.floor(Math.random() * max)` for integers. It’s simple and built-in. I use it for games or random selections.

Question 8

What is a proxy in JavaScript?

Accepted Answer

A `Proxy` wraps an object to intercept operations like property access or assignment. You define traps in a handler to customize behavior. I use it for logging or validation—pretty advanced stuff!

Question 9

How do you remove duplicates from an array?

Accepted Answer

You can remove duplicates with `Set`—like `([...new Set(arr)])`—since Sets only store unique values. It’s quick and clean, though it doesn’t preserve order in older browsers. I use it unless I need something fancier.

Question 10

What is currying in JavaScript?

Accepted Answer

Currying transforms a function with multiple arguments into a series of single-argument functions. It’s useful for partial application and reusable code. I find it handy in functional programming for creating specific utilities.

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