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As a non-programmer, why does it do this? Sorting by leftmost digit seems super dumb.
You can put any type of value in an array in JavaScript. You can have numbers, strings, booleans, arrays, and objects. So what should the default sort function sort by? Sorting by numbers makes sense, but what if it wanted to sort strings instead?
When you don't know what value is in an array ahead of time you can't assume how to sort it. When you're controlling the program you can provide a sort function for the type of values you know will be in it, but when you're writing the standard default sort function, there's only one type that you can convert all the other types to safely and simply in the most predictable way, which is strings.
"By default, the sort() function sorts values as strings.
This works well for strings ("Apple" comes before "Banana").
However, if numbers are sorted as strings, "25" is bigger than "100", because "2" is bigger than "1".
Because of this, the sort() method will produce incorrect result when sorting numbers."
It also produces incorrect results in many languages other than English. You can pass it a compare function that uses localeCompare or Intl.Collator to get a correct alphabetical sort.
Because it turns everything into text first. Just in case you try to sort [1,"apple",45.99,false,[true,3]] rather than an array of similar things like a normal person.
Because when it's sorting some of them as ints and some of them as strings. JavaScript has implicit conversion to string.
Wrong. JavaScript sort's default comparison function always converts to strings.
Only if one of them is a string right? If you have only numbers then it works fine right? Right? (Please say that I'm right 😭)
No. It always compares by converting to string. I actually think this is more consistent then having different behaviour if you have a string somewhere in your list.
Basically the default comparator is
a.sort((a, b) => `${a}` < `${b}` ? -1 : 1).
Think of digits like you would letters. You're essentially sorting numbers alphabetically. It's not the right way to do it, of course, but it's the natural way to do it using a system like computers use that doesn't necessarily differentiate between digits and letters unless you tell it to specifically.
I think the main shortcoming here is that there isnt a way to specify the type to sort as, instead you have to write the function to compare them as numbers yourself. If it's such a simple implementation, why isn't it officially implemented? Why isn't there a sortAs() that takes two args, the input list, and a Type value? Check every element matches the type and then sort, otherwise return a Type Error.
I mean, there's a sort() method that takes a comparator(a,b) such that if a comes first it returns 1, if b comes first it returns -1 and if they're equivalent wrt sortinf it returns 0. If you absolutely need type safe number sorting you can use that to get it.
Right, but you have to make that comparator yourself, it's not a built-in part of the language. The only built-in comparator converts values to strings and compares them in code units orders.
Also, that technically isnt type-safe, is it? If you threw a string or a NaN at that it would fail. As far as I knew, type safe means that a function can handle type errors itself, rather than throwing an exception. So in this case the function would automatically convert types if it was type-safe to prevent an unhandled exception.
Not every use case can be the built-in default. I wouldn't have made JS weakly typed if I were designing it, but once the decision was made to use weak typing it made sense to either have no default sort method or to have a default sort method that assumes a type.
What I've outlined for you is the interface for a comparator, not the implementation. You can type check and convert and do anything else you want under the hood of the comparator you write.
It doesn't have to be the default to be built in, tho. It could be an overloaded function, having the "default" be the typical convert-to-string sorting, and an overloaded function that allows to specify a type.
It's just such a common thing, wanting to sort a list by different types, that I'm surprised there hasn't been an official implementation added like this. I get that it a simple "fix" to make, but I just think that if it's that simple yet kind of obscure (enough that people are still constantly asking about it) there should be an official implementation, rather than something you have build yourself.
Thats just JS for you. If you're being generous, it's a "quirky" language. If you're being ungenerous, it's a steaming pile of arbitrary decisions, gotchas, unexpected behaviors and problems that no one bothered to solve because there's a workaround.
Yeah, JS always seemed like the red-headed stepchild of modern languages. I'd be curious to know if other ECMAScript languages like JScript are as, eh, "quirky", suggesting that the ECMA spec is the source of the quirkiness, or if JavaScript itself is the one making silly decisions. Technically, I mostly work with Google's AppScript when I use ECMAScript stuff, but I'm fairly certain AppsScript is based off of JavaScript instead of directly based on the ECMA spec, so I don't think it's separate enough for me to draw a conclusion there.
It sorts them based on their unicode character, not the actual numbers. 1 is U+0031, 2 is U+0032, etc.
it's lexicographic order