Browser Object Model (BOM) — JS Technical Interview Questions & Answers

Browser-provided objects outside the page's DOM.

Browser Object Model (BOM)

  • Browser Object Model (BOM) (js intro) is a JS topic. In plain words you use it for let total = 0 in a cart script. Don’t start with a slogan — start with that picture.
  • Smallest example: let for change, const for fixed. Type it, run it, and say what you see. If you can do that from memory, you know Browser Object Model (BOM) (js intro).
  • From the example next to this theory: Browser-provided objects outside the page's DOM.
  • Trap: var leak / const reassign. Fix that before you talk about advanced JS.
  • Viva: what is Browser Object Model (BOM) (js intro)? Then show let for change, const for fixed. Then name the trap.

Technical Interview Tip: What is Browser Object Model (BOM) (js intro)? Show this: let for change, const for fixed. Trap: var leak / const reassign.

Code Examples for Browser Object Model (BOM)

Browser Object Model (BOM) — working example

// Browser BOM sketch (not available in Node/Piston):
// console.log(window.innerWidth, navigator.userAgent);
// location.assign("/prep"); history.back();

// Runnable stand-in:
const windowLike = { innerWidth: 1280, location: { href: "/home" }, history: [] };
windowLike.history.push(windowLike.location.href);
windowLike.location.href = "/prep";
console.log(windowLike.innerWidth, windowLike.location.href, windowLike.history);

Browser Object Model (BOM) — bOM APIs (window, navigator, location, history) talk to the browser chrome around the DOM.

How to Explain Browser Object Model (BOM) to an Interviewer

What is Browser Object Model (BOM) (js intro)?

Used for let total = 0 a cart script Not just the heading

Give one small example of Browser Object Model (BOM) (js intro).

let for change, const for fixed Browser-provided objects outside the page's DOM

What mistake do beginners make with Browser Object Model (BOM) (js intro)?

var leak / const reassign Show the fix

Where do you use Browser Object Model (BOM) (js intro)?

a cart script let total = 0