TL;DR: JavaScript has notorious quirks because it was designed in just ten days as a prototype to help Netscape survive the early browser wars. Because the internet relies on absolute backwards compatibility, these rushed design flaws became permanent APIs that we must support forever to avoid breaking the web.
I've lost count of the times I've stared at a console, questioning my career choices because of some bizarre JavaScript coercion behavior. Maybe it is the fact that typeof null returns "object", or that sorting an array of numbers alphabetically arranges them as [1, 10, 2, 20].
Whenever I am digging through these quirks, I try to remind myself of how we got here. I find it absolutely mad that the language powering almost every modern user interface on earth was built as a rushed, two-week prototype. It is the ultimate real-world case of "protoduction"—a temporary hack thrown directly into production under existential company pressure.
Why does JavaScript have so many design flaws?
JavaScript has so many design flaws because it was designed and implemented in just ten days by Brendan Eich at Netscape in 1995. Rushed to market to win the early browser wars against Microsoft, the language was never intended to be the final product, meaning early prototype compromises became permanent.
