Reflect.ownKeys() — JS Technical Interview Questions & Answers

Returns all own property keys, including symbols.

Reflect.ownKeys()

  • Reflect.ownKeys() is a JS topic. In plain words you use it for a short Reflect.ownKeys example in a script in the browser. Don’t start with a slogan — start with that picture.
  • Smallest example: the smallest Reflect.ownKeys example you can type. Type it, run it, and say what you see. If you can do that from memory, you know Reflect.ownKeys().
  • From the example next to this theory: Returns all own property keys, including symbols.
  • Trap: only saying “Reflect.ownKeys” with no example. Fix that before you talk about advanced JS.
  • Viva: what is Reflect.ownKeys()? Then show the smallest Reflect.ownKeys example you can type. Then name the trap.

Technical Interview Tip: What is Reflect.ownKeys()? Show this: the smallest Reflect.ownKeys example you can type. Trap: only saying “Reflect.ownKeys” with no example.

Code Examples for Reflect.ownKeys()

Reflect.ownKeys() — working example

// Topic: Reflect.ownKeys()
const nums = [1, 2, 3];
const doubled = nums.map((n) => n * 2);
console.log(doubled);
console.log(doubled.reduce((a, b) => a + b, 0));

Reflect.ownKeys(): map then reduce on [1, 2, 3]. Say both prints.

How to Explain Reflect.ownKeys() to an Interviewer

What is Reflect.ownKeys()?

Used for a short Reflect.ownKeys example a script in the browser Not just the heading

Give one small example of Reflect.ownKeys().

the smallest Reflect.ownKeys example you can type Returns all own property keys, including symbols

What mistake do beginners make with Reflect.ownKeys()?

only saying “Reflect.ownKeys” with no example Show the fix

Where do you use Reflect.ownKeys()?

a script in the browser a short Reflect.ownKeys example