Styjun

Why do you need to heat the pan before heating the olive oil?

Is using legacy mode instead of UEFI mode a bad thing to do?

First occurrence in the Sixers sequence

Is there a polite way to ask about one's ethnicity?

How do you transpose samples in cents?

How could I create a situation in which a PC has to make a saving throw or be forced to pet a dog?

Would a 7805 5 V regulator drain a 9 V battery?

Bent arrow under a node

Make symbols atomic, without losing their type

Examples of protocols that are insecure when run concurrently

Why is it 出差去 and not 去出差?

What is this airplane that sits in front of Barringer High School in Newark, NJ?

I just entered the USA without passport control at Atlanta airport

Math symbols in math operators

What is the highest power supply a Raspberry pi 3 B can handle without getting damaged?

How would you explain #1 and #2 below using standard quotes?

Is declining an undergraduate award which causes me discomfort appropriate?

What kind of chart is this?

Am I legally required to provide a (GPL licensed) source code even after a project is abandoned?

How to make all magic-casting innate, but still rare?

Old time bike. Can I put a rear derailleur?

How Hebrew Vowels Work

How to ask if I can mow my neighbor's lawn

Why was New Asgard established at this place?

return the uppercase alphabets

compare the length of two list and append in racketParsing through a list in racket(Racket) Interpreting Seq to return last expression in listLearning DrRacket, Why will this not return false?Converting numbers to english letter listReturn an integer literal from a Scheme functionIN Racket Define a function that takes two argumentsString on empty-scene (racket)Scheme - returning first n-elements of an arrayTrying to get this code to work, can't understand where to put the argument in and keep getting errors

.everyoneloves__top-leaderboard:empty,.everyoneloves__mid-leaderboard:empty,.everyoneloves__bot-mid-leaderboard:empty height:90px;width:728px;box-sizing:border-box;

0

I am writing a function which can return the uppercase alphabets from an input string. And it works well when I display it. However, can anyone tell me how to return the output string rather than just display it?

(define (convert input)
 (define s(string))
 (for ([i (string->list input)])
 (when (char-alphabetic? i)
 (let ((s(string-append s (string i))))
 (display (string-upcase s))))))

racket

share|improve this question

edited Mar 25 at 6:09

eyllanesc

96.8k123770

asked Mar 25 at 5:58

user11104854

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it's racket it seems.
  
  – mallikarjun
  Mar 25 at 6:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Looking to see if IntelliJ has a 'racket' plugin, lol...
  
  – Steve
  Mar 25 at 6:04
  

  
  
  
  

add a comment | 

0

I am writing a function which can return the uppercase alphabets from an input string. And it works well when I display it. However, can anyone tell me how to return the output string rather than just display it?

(define (convert input)
 (define s(string))
 (for ([i (string->list input)])
 (when (char-alphabetic? i)
 (let ((s(string-append s (string i))))
 (display (string-upcase s))))))

racket

share|improve this question

edited Mar 25 at 6:09

eyllanesc

96.8k123770

asked Mar 25 at 5:58

user11104854

• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  it's racket it seems.
  
  – mallikarjun
  Mar 25 at 6:01
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  Looking to see if IntelliJ has a 'racket' plugin, lol...
  
  – Steve
  Mar 25 at 6:04
  

  
  
  
  

add a comment | 

I am writing a function which can return the uppercase alphabets from an input string. And it works well when I display it. However, can anyone tell me how to return the output string rather than just display it?

(define (convert input)
 (define s(string))
 (for ([i (string->list input)])
 (when (char-alphabetic? i)
 (let ((s(string-append s (string i))))
 (display (string-upcase s))))))

racket

share|improve this question

edited Mar 25 at 6:09

eyllanesc

96.8k123770

asked Mar 25 at 5:58

user11104854

(define (convert input)
 (define s(string))
 (for ([i (string->list input)])
 (when (char-alphabetic? i)
 (let ((s(string-append s (string i))))
 (display (string-upcase s))))))

share|improve this question

edited Mar 25 at 6:09

eyllanesc

96.8k123770

asked Mar 25 at 5:58

user11104854

share|improve this question

edited Mar 25 at 6:09

eyllanesc

96.8k123770

asked Mar 25 at 5:58

user11104854

edited Mar 25 at 6:09

eyllanesc

96.8k123770

edited Mar 25 at 6:09

eyllanesc

96.8k123770

2 Answers
2

active

oldest

votes

2

If you want to return data from a function, like you are here with returning a string, I suggest you look past the basic for loop to its variants, such as for/list, for/vector, for/hash, and for/fold. In this case for/list can help:

(define (convert input)
 (list->string
 (for/list ([i input] #:when (char-alphabetic? i))
 (char-upcase i))))

Using it:

> (convert "ab1c23")
"ABC"

share|improve this answer

answered Mar 25 at 12:16

Alex KnauthAlex Knauth

5,3881823

add a comment | 

1

Here's one possible solution:

(define (convert input)
 (list->string
 (foldr (lambda (chr acc)
 (if (char-alphabetic? chr)
 (cons (char-upcase chr) acc)
 acc))
 '()
 (string->list input))))

We need to accumulate the result somewhere, instead of printing char by char. For that, we use foldr to process a list of chars, uppercasing alphabetic chars and ignoring the others. This produces a list of chars that we convert back to a string using list->string. It works as expected:

(convert "ab1c23")
=> "ABC"

share|improve this answer

answered Mar 25 at 10:35

Óscar LópezÓscar López

185k26241332

add a comment | 

Your Answer

StackExchange.ifUsing("editor", function ()
StackExchange.using("externalEditor", function ()
StackExchange.using("snippets", function ()
StackExchange.snippets.init();
);
);
, "code-snippets");

StackExchange.ready(function()
var channelOptions =
tags: "".split(" "),
id: "1"
;
initTagRenderer("".split(" "), "".split(" "), channelOptions);

StackExchange.using("externalEditor", function()
// Have to fire editor after snippets, if snippets enabled
if (StackExchange.settings.snippets.snippetsEnabled)
StackExchange.using("snippets", function()
createEditor();
);

else
createEditor();

);

function createEditor()
StackExchange.prepareEditor(
heartbeatType: 'answer',
autoActivateHeartbeat: false,
convertImagesToLinks: true,
noModals: true,
showLowRepImageUploadWarning: true,
reputationToPostImages: 10,
bindNavPrevention: true,
postfix: "",
imageUploader:
brandingHtml: "Powered by u003ca class="icon-imgur-white" href="https://imgur.com/"u003eu003c/au003e",
contentPolicyHtml: "User contributions licensed under u003ca href="https://creativecommons.org/licenses/by-sa/3.0/"u003ecc by-sa 3.0 with attribution requiredu003c/au003e u003ca href="https://stackoverflow.com/legal/content-policy"u003e(content policy)u003c/au003e",
allowUrls: true
,
onDemand: true,
discardSelector: ".discard-answer"
,immediatelyShowMarkdownHelp:true
);



);

draft saved

draft discarded

Sign up or log in

StackExchange.ready(function ()
StackExchange.helpers.onClickDraftSave('#login-link');
);

Sign up using Google

Sign up using Facebook

Sign up using Email and Password

Post as a guest

Name

Email

Required, but never shown

StackExchange.ready(
function ()
StackExchange.openid.initPostLogin('.new-post-login', 'https%3a%2f%2fstackoverflow.com%2fquestions%2f55331967%2freturn-the-uppercase-alphabets%23new-answer', 'question_page');

);

Post as a guest

Name

Email

Required, but never shown

2

If you want to return data from a function, like you are here with returning a string, I suggest you look past the basic for loop to its variants, such as for/list, for/vector, for/hash, and for/fold. In this case for/list can help:

(define (convert input)
 (list->string
 (for/list ([i input] #:when (char-alphabetic? i))
 (char-upcase i))))

Using it:

> (convert "ab1c23")
"ABC"

share|improve this answer

answered Mar 25 at 12:16

Alex KnauthAlex Knauth

5,3881823

add a comment | 

2

If you want to return data from a function, like you are here with returning a string, I suggest you look past the basic for loop to its variants, such as for/list, for/vector, for/hash, and for/fold. In this case for/list can help:

(define (convert input)
 (list->string
 (for/list ([i input] #:when (char-alphabetic? i))
 (char-upcase i))))

Using it:

> (convert "ab1c23")
"ABC"

share|improve this answer

answered Mar 25 at 12:16

Alex KnauthAlex Knauth

5,3881823

add a comment | 

If you want to return data from a function, like you are here with returning a string, I suggest you look past the basic for loop to its variants, such as for/list, for/vector, for/hash, and for/fold. In this case for/list can help:

(define (convert input)
 (list->string
 (for/list ([i input] #:when (char-alphabetic? i))
 (char-upcase i))))

Using it:

> (convert "ab1c23")
"ABC"

share|improve this answer

answered Mar 25 at 12:16

Alex KnauthAlex Knauth

5,3881823

(define (convert input)
 (list->string
 (for/list ([i input] #:when (char-alphabetic? i))
 (char-upcase i))))

> (convert "ab1c23")
"ABC"

share|improve this answer

answered Mar 25 at 12:16

Alex KnauthAlex Knauth

5,3881823

answered Mar 25 at 12:16

Alex KnauthAlex Knauth

5,3881823

answered Mar 25 at 12:16

Alex KnauthAlex Knauth

5,3881823

1

Here's one possible solution:

(define (convert input)
 (list->string
 (foldr (lambda (chr acc)
 (if (char-alphabetic? chr)
 (cons (char-upcase chr) acc)
 acc))
 '()
 (string->list input))))

We need to accumulate the result somewhere, instead of printing char by char. For that, we use foldr to process a list of chars, uppercasing alphabetic chars and ignoring the others. This produces a list of chars that we convert back to a string using list->string. It works as expected:

(convert "ab1c23")
=> "ABC"

share|improve this answer

answered Mar 25 at 10:35

Óscar LópezÓscar López

185k26241332

add a comment | 

1

Here's one possible solution:

(define (convert input)
 (list->string
 (foldr (lambda (chr acc)
 (if (char-alphabetic? chr)
 (cons (char-upcase chr) acc)
 acc))
 '()
 (string->list input))))

We need to accumulate the result somewhere, instead of printing char by char. For that, we use foldr to process a list of chars, uppercasing alphabetic chars and ignoring the others. This produces a list of chars that we convert back to a string using list->string. It works as expected:

(convert "ab1c23")
=> "ABC"

share|improve this answer

answered Mar 25 at 10:35

Óscar LópezÓscar López

185k26241332

add a comment | 

Here's one possible solution:

(define (convert input)
 (list->string
 (foldr (lambda (chr acc)
 (if (char-alphabetic? chr)
 (cons (char-upcase chr) acc)
 acc))
 '()
 (string->list input))))

We need to accumulate the result somewhere, instead of printing char by char. For that, we use foldr to process a list of chars, uppercasing alphabetic chars and ignoring the others. This produces a list of chars that we convert back to a string using list->string. It works as expected:

(convert "ab1c23")
=> "ABC"

share|improve this answer

answered Mar 25 at 10:35

Óscar LópezÓscar López

185k26241332

(define (convert input)
 (list->string
 (foldr (lambda (chr acc)
 (if (char-alphabetic? chr)
 (cons (char-upcase chr) acc)
 acc))
 '()
 (string->list input))))

(convert "ab1c23")
=> "ABC"

share|improve this answer

answered Mar 25 at 10:35

Óscar LópezÓscar López

185k26241332

answered Mar 25 at 10:35

Óscar LópezÓscar López

185k26241332

answered Mar 25 at 10:35

Óscar LópezÓscar López

185k26241332