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Peter Kim Frank -
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Top comments (14)
this
Type coercion is definitely not obvious in JavaScript
IMHO, don't ever ever ever use
==in JavaScript. Always use===instead and forget about type coercion; just explicitly type-cast anything you need to.It's a very rare case when you work on a project alone. Other developers can use == and it's necessary to understand how type coercion works.
I agree that most of developers consider == as evil. But Kyle Simpson (You don't know JS author) don't hate type coercion. Moreover, he recomments to use == where necessary.
Source.
When I started writing JS it was hard to get an understanding of what
prototypeis and how it's used.Closures. It's a complicated subject involving an understanding of how the execution context works and how variables are scoped and held within the JavaScript engine. It takes a lot of practice and theory for closures to finally click. It took me like six months to finally grok it.
Javascript has a lot of layers. Understanding what is controlling each piece can be hard to parse if you're new. I actually wrote something on this a while back.
The Layers of Javascript
Laurie ・ 3 min read
Newest confusion is parseInt. Just try and see what happens if you do
parseInt(0.000000347)typeOf null = 'Object'
How come they didn't actually go with 'smoosh'?
The ecosystem. Every time I come back to JS the tooling is entirely different. Makes it frustrating to get things done.
I have a few things that I considered confusing when I started learning JS..scope, hoisting, closures, callbacks