Turning undefined into a function: one tweet’s solution to frontend woes

Description

Screenshot of a tweet in the standard Twitter UI. The tweet text reads: "That's it. I solved front end development." Beneath it is a dark-themed code block displaying: "Object.prototype[undefined] = function() { console.log(\"undefined IS a function now!\"); }". A small grey "ALT" badge appears at the lower-left of the snippet, and a watermark "t.me/dev_meme" sits underneath. The meme humorously "fixes" the classic JavaScript error "undefined is not a function" by adding an undefined key to Object.prototype, highlighting prototype pollution, type coercion quirks, and the sometimes reckless creativity of frontend engineers

Common Tags

Javascript Frontend LanguageQuirks DeveloperHumor CodingHumor UndefinedBehavior

Comments

Anonymous ★ Top Pick Achieved 100% green tests by making undefined a function on Object.prototype - sure, it’s also a planet-scale prototype-pollution CVE, but the dashboard is green and that’s what the OKR tracks

Anonymous ★ Top Pick

Achieved 100% green tests by making undefined a function on Object.prototype - sure, it’s also a planet-scale prototype-pollution CVE, but the dashboard is green and that’s what the OKR tracks
Anonymous

After 20 years in the industry, I've finally accepted that JavaScript's 'undefined is not a function' isn't a bug report - it's a philosophical statement about the nature of existence in a weakly-typed universe where even nothing can be something if you prototype it hard enough
Anonymous

Ah yes, the classic 'fix the symptom, not the cause' approach - because nothing says 'senior engineer' quite like polluting Object.prototype to paper over type errors. This is the architectural equivalent of fixing a memory leak by downloading more RAM. Sure, 'undefined is not a function' won't throw anymore, but congratulations: you've just created a Heisenbug that will haunt code reviews for years and make every library maintainer weep. It's the kind of 'solution' that gets you promoted to a different team... very quickly
Anonymous

Bold strategy: convert “TypeError: undefined is not a function” into a company‑wide for…in incident - congrats, you just launched Prototype‑Pollution‑as‑a‑Service
Anonymous

Bold move - patch Object.prototype[undefined] so the TypeError vanishes and every for…in across the fleet starts iterating 'undefined'; a one-line fix that upgrades a bug into a distributed outage
Anonymous

Prototype pollution since ES1: the frontend dev's shortcut to 'solved' today, legacy regret tomorrow
@azizhakberdiev 4y

JS be like:
@misesOnWheels 4y

null is a value, why not just point it to a null ?
1. @RiedleroD 4y
  
  pointers in javascript… are you mad?
  
  Deleted Account 4y
  
  Wait, you have pointers in js? Wha....
  
  @RiedleroD 4y
  
  you don't, that's the point(er, haha)
  
  Deleted Account 4y
  
  Haha
  
  dev_meme 4y
  
  whhoooops