For arrays, indexing is unambiguous: `array[42]` is whatever value you put there. As a result, it’s clear what it means to “reverse” an array.
This is not the case for strings, where indexing is inherently ambiguous. Should `string[42]` index by UCS-2/UTF-16 code unit? By Unicode code point? By grapheme cluster? On Mon, Mar 19, 2018 at 6:28 AM, Felipe Nascimento de Moura < [email protected]> wrote: > I have had to use that one, parsing texts and I remember I had to reverse > strings that represented tokens...but that was very specific. > > What I would like to see in strings would be something like "firstCase" > for transforming "felipe" into "Felipe" for example. > I always have to use something like `str[0].toUpperCase() + str.slice(1)`. > > The only reason I would defend the "reverse" method in strings is because > it makes sense. > I think JavaScript is very intuitive, and, as Arrays do have the "reverse" > method, that simply makes sense to have it in strings as well. > > Cheers. > > > [ ]s > > *--* > > *Felipe N. Moura* > Web Developer, Google Developer Expert > <https://developers.google.com/experts/people/felipe-moura>, Founder of > BrazilJS <https://braziljs.org/> and Nasc <http://nasc.io/>. > > Website: http://felipenmoura.com / http://nasc.io/ > Twitter: @felipenmoura <http://twitter.com/felipenmoura> > Facebook: http://fb.com/felipenmoura > LinkedIn: http://goo.gl/qGmq > --------------------------------- > *Changing the world* is the least I expect from myself! > > On Sun, Mar 18, 2018 at 12:00 PM, Mark Davis ☕️ <[email protected]> > wrote: > >> .reverse would only be reasonable for a subset of characters supported by >> Unicode. Its primary cited use case is for a particular educational >> example, when there are probably thousands of similar examples of educational >> snippets that would be rarely used in a production environment. Given >> that, it would be far better for those people who really need it to just >> provide that to their students as a provided function for the sake of that >> example. >> >> Mark >> >> On Sun, Mar 18, 2018 at 8:56 AM, Grigory Hatsevich <[email protected] >> > wrote: >> >>> "This would remove the challenge and actively worsen their learning >>> process" -- this is not true. You can see it e.g. by looking at the >>> specific task I was talking about: >>> >>> "Given a string, find the shortest possible string which can be achieved >>> by adding characters to the end of initial string to make it a palindrome." >>> >>> This is my code for this task: >>> >>> function buildPalindrome(s){ >>> String.prototype.reverse=function(){ >>> return this.split('').reverse().join('') >>> } >>> >>> function isPalindrome(s){ >>> return s===s.reverse() >>> } >>> for (i=0;i<s.length;i++){ >>> first=s.slice(0,i); >>> rest=s.slice(i); >>> if(isPalindrome(rest)){ >>> return s+first.reverse() >>> } >>> } >>> } >>> >>> >>> As you see, the essence of this challenge is not in the process of >>> reversing a string. Having a reverse() method just makes the code more >>> readable -- comparing to alternative when one would have to write >>> .split('').reverse().join('') each time instead of just .reverse() >>> >>> On Sun, Mar 18, 2018 at 2:38 PM, Frederick Stark <[email protected]> >>> wrote: >>> >>>> The point of a coding task for a beginner is to practice their problem >>>> solving skills to solve the task. This would remove the challenge and >>>> actively worsen their learning process >>>> >>>> >>>> On Mar 18 2018, at 6:26 pm, Grigory Hatsevich <[email protected]> >>>> wrote: >>>> >>>> >>>> My use case is solving coding tasks about palindromes on codefights.com. >>>> Not sure if that counts as "real-world", but probably a lot of beginning >>>> developers encounter such tasks at least once. >>>> >>>> >>>> >>>> >>>> On Sun, 18 Mar 2018 06:41:46 +0700, Mathias Bynens <[email protected]> >>>> wrote: >>>> >>>> So far no one has provided a real-world use case. >>>> >>>> On Mar 18, 2018 10:15, "Mike Samuel" <[email protected] >>>> <https://link.getmailspring.com/link/[email protected]/0?redirect=mailto%3Amikesamuel%40gmail.com&recipient=Zy5oYXRzZXZpY2hAZ21haWwuY29t>> >>>> wrote: >>>> >>>> Previous discussion: https://esdiscuss.org/topic/wi >>>> ki-updates-for-string-number-and-math-libraries#content-1 >>>> <https://link.getmailspring.com/link/[email protected]/1?redirect=https%3A%2F%2Fesdiscuss.org%2Ftopic%2Fwiki-updates-for-string-number-and-math-libraries%23content-1&recipient=Zy5oYXRzZXZpY2hAZ21haWwuY29t> >>>> >>>> """ >>>> String.prototype.reverse(), as proposed, corrupts supplementary >>>> characters. Clause 6 of Ecma-262 redefines the word "character" as "a >>>> 16-bit unsigned value used to represent a single 16-bit unit of text", that >>>> is, a UTF-16 code unit. In contrast, the phrase "Unicode character" is used >>>> for Unicode code points. For reverse(), this means that the proposed spec >>>> will reverse the sequence of the two UTF-16 code units representing a >>>> supplementary character, resulting in corruption. If this function is >>>> really needed (is it? for what?), it should preserve the order of surrogate >>>> pairs, as does java.lang.StringBuilder.reverse: >>>> download.oracle.com/javase/7/docs/api/java/lang/StringBuil >>>> der.html#reverse() >>>> <https://link.getmailspring.com/link/[email protected]/2?redirect=http%3A%2F%2Fdownload.oracle.com%2Fjavase%2F7%2Fdocs%2Fapi%2Fjava%2Flang%2FStringBuilder.html%23reverse()&recipient=Zy5oYXRzZXZpY2hAZ21haWwuY29t> >>>> """ >>>> >>>> On Sat, Mar 17, 2018 at 1:41 PM, Grigory Hatsevich < >>>> [email protected] >>>> <https://link.getmailspring.com/link/[email protected]/3?redirect=mailto%3Ag.hatsevich%40gmail.com&recipient=Zy5oYXRzZXZpY2hAZ21haWwuY29t>> >>>> wrote: >>>> >>>> Hi! I would propose to add reverse() method to strings. Something >>>> equivalent to the following: >>>> >>>> String.prototype.reverse = function(){ >>>> return this.split('').reverse().join('') >>>> } >>>> >>>> It seems natural to have such method. Why not? >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> es-discuss mailing list >>>> [email protected] >>>> <https://link.getmailspring.com/link/[email protected]/4?redirect=mailto%3Aes-discuss%40mozilla.org&recipient=Zy5oYXRzZXZpY2hAZ21haWwuY29t> >>>> https://mail.mozilla.org/listinfo/es-discuss >>>> <https://link.getmailspring.com/link/[email protected]/5?redirect=https%3A%2F%2Fmail.mozilla.org%2Flistinfo%2Fes-discuss&recipient=Zy5oYXRzZXZpY2hAZ21haWwuY29t> >>>> >>>> >>>> >>>> >>>> _______________________________________________ >>>> es-discuss mailing list >>>> [email protected] >>>> https://mail.mozilla.org/listinfo/es-discuss >>>> >>>> [image: Open Tracking] >>> >>> >>> >>> _______________________________________________ >>> es-discuss mailing list >>> [email protected] >>> https://mail.mozilla.org/listinfo/es-discuss >>> >>> >> >> _______________________________________________ >> es-discuss mailing list >> [email protected] >> https://mail.mozilla.org/listinfo/es-discuss >> >> > > _______________________________________________ > es-discuss mailing list > [email protected] > https://mail.mozilla.org/listinfo/es-discuss > >
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