How do I approach Other / Miscellaneous interview questions?

Other / Miscellaneous questions require understanding of core concepts and practice. PracHub provides solutions with explanations to help you master other / miscellaneous interviews.

What difficulty level is this interview question?

This is a medium difficulty Other / Miscellaneous question, commonly asked during HR Screen rounds at LinkedIn.

What role is this question designed for?

This question is commonly asked for Software Engineer candidates at LinkedIn during technical interviews.

Implement map and render to DOM | LinkedIn Interview Question

Quick Overview

This question evaluates a candidate's skills in vanilla JavaScript utility implementation and DOM rendering, covering array and plain-object iteration semantics, higher-order functions, input validation, error handling, and safe text rendering for browser environments.

Build a Vanilla JS map-like Utility and DOM Renderer

Context

You are working in a basic browser environment with no frameworks or libraries. Implement a function that behaves like Array.prototype.map but must:

Not use the built-in map method.
Work for both arrays and plain key–value objects ("dictionaries").

Then use it to transform a list of objects into a render-friendly shape and render one div per transformed item into the DOM, with appropriate classes/attributes. Handle empty and error states.

Requirements

Implement a map-like function that:
- Accepts an input list (array or plain object), a callback, and an optional thisArg.
- For arrays: iterates items (skipping holes) and returns a new array of mapped results.
- For objects: iterates own enumerable keys and returns a new array of mapped results.
- Validates inputs and throws a helpful error if misused.
Implement a renderer that:
- Renders one div per transformed item into a container in the DOM.
- Applies classes and any attributes provided by the transformed items.
- Uses safe text rendering (no innerHTML for untrusted data).
- Shows an empty state if there are no items.
- Shows an error state if something goes wrong.
Use only vanilla JavaScript in a script tag. No frameworks.

Quick Overview

Context

You are working in a basic browser environment with no frameworks or libraries. Implement a function that behaves like Array.prototype.map but must:

Not use the built-in map method.

Work for both arrays and plain key–value objects ("dictionaries").

Then use it to transform a list of objects into a render-friendly shape and render one div per transformed item into the DOM, with appropriate classes/attributes. Handle empty and error states.

Requirements

Implement a map-like function that:

Accepts an input list (array or plain object), a callback, and an optional thisArg.
For arrays: iterates items (skipping holes) and returns a new array of mapped results.
For objects: iterates own enumerable keys and returns a new array of mapped results.
Validates inputs and throws a helpful error if misused.

Implement a renderer that:

Renders one div per transformed item into a container in the DOM.
Applies classes and any attributes provided by the transformed items.
Uses safe text rendering (no innerHTML for untrusted data).
Shows an empty state if there are no items.
Shows an error state if something goes wrong.

Use only vanilla JavaScript in a script tag. No frameworks.

Implement map and render to DOM

Quick Overview

Build a Vanilla JS map-like Utility and DOM Renderer

Context

Requirements

Solution

Comments (0)

Implement map and render to DOM

Quick Overview

Build a Vanilla JS map-like Utility and DOM Renderer

Context

Requirements

Solution

Comments (0)