Cons/Dislikes

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Cons/Dislikes
No conventions.
Not standardized.
No consistency in online resources.
Lots of outdated online resources.
The fact that AirBNB has 20 pages on how to write JavaScript is insane.
No first class Enums
No types. Can be handled by Flow or TypeScript​
Callback hell (work around with Promises, async and await, but its not supported everywhere)
Inconsisent: Array.length vs Set.size
Like wtf?
All the problems of a loosely typed language.
Hard to scale as a language, due to no types.
Hard to refactor.
Inconsistencies in coding style amongst the community
JS Modules are confusing
Requires high code coverage due to inconsistencies.
Changing babel flags can make your code run differently
Requires high code coverage to ensure it does as expected.
You need tools like lodash for basic stuff (bucketing items in in an array, groupBy)
Requires a lot of tooling to maintain JavaScript
Was design for client side browsing, not server side
It has both null and undefined
No native sprintf
Browser support is inconsistent.
I ran into a problem with fetch() not being supported. https://github.com/github/fetch#browser-support​
Requires a lot of static analysis tools.
jshint http://jshint.com/about/ 
flow
See Node.js's creator Ryan Dahl's "10 Things I Regret About Node.js"
What does this return?
1
"some string".match(/some regex/)
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It's an Array with properties of index and input. 
Things which increase the JavaScript environments complexity:
Requiring the use of new features via Babel
Requiring WebPack to bundle for frontend
Module systems
Inconsistent environments
Browser development, so many browser versions
Node, webpack vs everything else
Array.flat
Array.flat only works in Node.js 11+
​https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/flat​
Array.values() is different from Object.values()
Object.values(object) returns an array of values
array.values() returns an iterator
​https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/values​
​https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/values​
No easy way to test that two Sets are equal
1
new Set(['a', 'b']) == new Set(['b', 'a']); // false
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​https://stackoverflow.com/questions/31128855/comparing-ecma6-sets-for-equality​
Collections
fetch
Last modified 3yr ago
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