JavaScript
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Well then, rage against the machine for the next 30 years and see if they kill it in favor of a nice, strict language that everybody loves. Maybe you could suggest one here for consideration.
So, all you've mustered is some lame-ass whataboutism?
Have a good day -
This is fair enough from an idealistic view. In practice, you don't want your entire website to shit itself because of a potentially insignificant error.
Look! I bought this for free on capybaras website, there's a glitch!
capybara: at least it didn't throw an error.
/ jk
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Obligatory link to wat? video
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You're right. I've got too much Perl on the brain and forgot my roots. There is a language that does what you're talking about with the '+' operator: BASIC
Good luck getting the same thing retrofitted into JavaScript though. I can imagine a large number of websites would break or develop mysterious problems if this (mis)behaviour was fixed.
I don't think there's a way to retrofit JS - but php versions are deprecated all the time. Why not do the same with client-side script versions?
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That is just the tip of the iceberg:
Oh wow, that's upsetting
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It's not nonsensical, implicit type coercion is a feature of JavaScript, it's perfectly logical and predictable.
JavaScript is a filthy beast, it's not the right tool for every job, but it's not nonsensical.
When you follow a string with a
+, it concatenates it with the next value (converted to string if needed). This makes sense, and it's a very standard convention in most languages.Applying arithmetic to a string would be nonsensical, which they don't do.
You are entitled to your opinion. implicit conversion to string is not a feature in most languages for good reasons.
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That is just the tip of the iceberg:
Not just javascript: https://www.destroyallsoftware.com/talks/wat
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That is just the tip of the iceberg:
Ugh, like... I get why it outputs like that, but I also absolutely hate that it outputs like that.
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If you try what I wrote it will throw a NaN. I was asking about the first part of the proposal.
The NaN isn't an thrown. It's just silently put into the result. And in this case it's completely unintelligible. Why would an operation between two strings result in a number?
"Hello" - "world"is an obvious programmer mistake. The interpreter knows that this is not something anyone will ever do on purpose, so it should not silently handle it.The main problem here is downward coercion. Coercion should only go towards the more permissive type, never towards the more restrictive type.
Coercing a number to a string makes sense, because each number has a representation as a string, so
"hello" + 1makes intuitive sense.Coercing a string to a number makes no sense, because not every string has a representation as a number (in fact, most strings don't).
"hello" - 1makes no sense at all. So converting a string to a number should be done by an explicit cast or a conversion function. Using-with a string should always result in a thrown error/exception. -
That is absolutely
(n > 1) * ("ba" + 0/0 + "a")(n > 1) * ("ba" + 0/0 + "a")
Uncaught ReferenceError: n is not defined
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That's the case in many languages, pretty much in all that don't have a separate string concatenation operator.
Yeah, and almost all languages I know then would throw an exception when you try to use
-with a string, and if they offer multiple operators that take a string and a number, they always only perform string operations with that and never cast to a number type to do math operations with it.(e.g. some languages have
+for string concatenation and*to add the same string X time together, so e.g."ab" * 2 => "abab". It's a terrible idea to have+perform a string operation and-performs a math operation.) -
Yeah, and almost all languages I know then would throw an exception when you try to use
-with a string, and if they offer multiple operators that take a string and a number, they always only perform string operations with that and never cast to a number type to do math operations with it.(e.g. some languages have
+for string concatenation and*to add the same string X time together, so e.g."ab" * 2 => "abab". It's a terrible idea to have+perform a string operation and-performs a math operation.)Sure, but then your issue is with type coercion, not operator overloading.
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Sure, but then your issue is with type coercion, not operator overloading.
Because there's in fact no operator overloading happening, true, but that's mostly an under-the-hood topic.
It should not happen no matter why it does happen under the hood.
Operator overloading for
string - stringis wrong and type coercion to implicitly cast this toint(string) - int(string)is just as wrong. -
Because there's in fact no operator overloading happening, true, but that's mostly an under-the-hood topic.
It should not happen no matter why it does happen under the hood.
Operator overloading for
string - stringis wrong and type coercion to implicitly cast this toint(string) - int(string)is just as wrong.wrote on last edited by [email protected]There is operator overloading happening - the
+operator has a different meaning depending on the types involved. Your issue however seems to be with the type coercion, not the operator overloading.It should not happen no matter why it does happen under the hood.
If you don't want it to happen either use a different language, or ensure you don't run into this case (e.g. by using Typescript). It's an unfortunate fact that this does happen, and it will never be removed due to backwards compatibility.
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There is operator overloading happening - the
+operator has a different meaning depending on the types involved. Your issue however seems to be with the type coercion, not the operator overloading.It should not happen no matter why it does happen under the hood.
If you don't want it to happen either use a different language, or ensure you don't run into this case (e.g. by using Typescript). It's an unfortunate fact that this does happen, and it will never be removed due to backwards compatibility.
There is operator overloading happening - the + operator has a different meaning depending on the types involved. Your issue however seems to be with the type coercion, not the operator overloading.
For
string + stringandnumber + numberthere is operator overloading, that's correct. Forstring + numberthere is not, there's only type coercion. It becomesstring + string(number). All of that is fine. Other languages do that as well.What's not fine is that JS also looks the other way on the type coercion tree: There's no
string - stringoverloading, so it goes down the type coercion tree, looking for any-operation that it can cast to and it ends up withnumber(string) - number(string), which makes no sense at all.If you don’t want it to happen either use a different language, or ensure you don’t run into this case (e.g. by using Typescript). It’s an unfortunate fact that this does happen, and it will never be removed due to backwards compatibility.
It's not the point of the discussion that there are other languages that are better. This here is about complaining about bad language design, and no matter how you turn this, this is not a matter of taste or anything, this is just bad language design.
You are obviously right that this crap will stay in JS forever. That doesn't make it good design.
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The NaN isn't an thrown. It's just silently put into the result. And in this case it's completely unintelligible. Why would an operation between two strings result in a number?
"Hello" - "world"is an obvious programmer mistake. The interpreter knows that this is not something anyone will ever do on purpose, so it should not silently handle it.The main problem here is downward coercion. Coercion should only go towards the more permissive type, never towards the more restrictive type.
Coercing a number to a string makes sense, because each number has a representation as a string, so
"hello" + 1makes intuitive sense.Coercing a string to a number makes no sense, because not every string has a representation as a number (in fact, most strings don't).
"hello" - 1makes no sense at all. So converting a string to a number should be done by an explicit cast or a conversion function. Using-with a string should always result in a thrown error/exception.wrote on last edited by [email protected]The interpreter knows that this is not something anyone will ever do on purpose, so it should not silently handle it.
You basically defied the whole NaN thing. I may even agree that it should always throw an error instead, but... Found a good explanation by someone:
NaN is the number which results from math operations which make no sense
And the above example fits that.
"hello" - 1makes no sense at all.Yeah but actually there can be many interpretations of what someone would mean by that. Increase the bytecode of the last symbol, or search for "1" and wipe it from string. The important thing is that it's not obvious what a person who wrote that wants really, without additional input.
Anyway, your original suggestion was about discrepancy between + and - functionality. I only pointed out that it's natural when dealing with various data types.
Maybe it is one of the reasons why some languages use . instead of + for strings.
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Look! I bought this for free on capybaras website, there's a glitch!
capybara: at least it didn't throw an error.
/ jk
Use typescript if you're paranoid about this
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I'd rather have my website shit itself than have silent difficult to find errors.
Use typescript
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This is exactly why it should throw an error, to make it incredibly obvious something isn't working correctly so it can be fixed. Otherwise you have wrong logic leading to hard to notice and hard to debug problems in your code
Use typescript
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In practice runtime errors are a bitch to find and fix.
Fair enough. This is why people prefer typescript
