Hi Squeakers,
I have a string: 'Hello'.
To reverse the letters I write:
a := 'Hello' reverse.
And I get 'olleH'.
How do I sort the letters alphabetically? So I get 'eHllo'?
a := 'Hello' sortBy: [:x :y | a < b ]
What parameter do you use to sort the letters? Do you have to convert them to a number, an Ascii or Unicode number first, and then sort those numbers?
Cheers, Chris Cunnington
On 17/05/07, Chris Cunnington cunnington@sympatico.ca wrote:
Hi Squeakers,
I have a string: 'Hello'.
To reverse the letters I write:
a := 'Hello' reverse.
And I get 'olleH'.
How do I sort the letters alphabetically? So I get 'eHllo'?
a := 'Hello' sortBy: [:x :y | a < b ]
What parameter do you use to sort the letters? Do you have to convert them to a number, an Ascii or Unicode number first, and then sort those numbers?
a := 'Hello' sort: [:x :y | x < y ] or a := 'Hello' sort: [:a :b | a < b ] but convention is to use x and y block parameters.
Each element of the string is a Character and has the #< defined. Note that 'Hello' is already sorted in Character order.
Others may like to comment on why
#sortBy: does not return a string.
<< #sortBy: does not return a string. >>
I was surprised that the collection returned does not respond to a message like asString. Anyway, this short code works:
t _ ('The cow jumped over the moon' sortBy: [ :x :y | x < y ]). s _ String new: t size. 1 to: t size do: [ :i | s at: i put: (t at: i) ].
You can also apply this approach based on inject:into:
t _ ('The cow jumped over the moon' sortBy: [ :x :y | x < y ]). t inject: String new into: [ :x :y | x, (String with: y) ].
Mark
Try ('The cow jumped over the mon' sortBy: [:x :y | x < y]) as: String.
On May 17, 2007, at 5:24 AM, Mark Bailey wrote:
<< #sortBy: does not return a string. >>
I was surprised that the collection returned does not respond to a message like asString. Anyway, this short code works:
t _ ('The cow jumped over the moon' sortBy: [ :x :y | x < y ]). s _ String new: t size. 1 to: t size do: [ :i | s at: i put: (t at: i) ].
You can also apply this approach based on inject:into:
t _ ('The cow jumped over the moon' sortBy: [ :x :y | x < y ]). t inject: String new into: [ :x :y | x, (String with: y) ].
Mark _______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Try ('The cow jumped over the mon' sortBy: [:x :y | x < y]) as: String.
That one's pretty cool. Sometimes I've tried things and you get a nasty array of characters ($a $b $c). That's an unpleasant answer. This solution puts it back into the form I expected initially. 'abc' Groovy.
Chris
On May 16, 2007, at 19:10 , Chris Cunnington wrote:
Hi Squeakers,
I have a string: 'Hello'.
To reverse the letters I write:
a := 'Hello' reverse.
And I get 'olleH'.
How do I sort the letters alphabetically? So I get 'eHllo'?
a := 'Hello' sortBy: [:x :y | a < b ]
What parameter do you use to sort the letters? Do you have to convert them to a number, an Ascii or Unicode number first, and then sort those numbers?
'Hello' sort: [:a :b | a asUppercase < b asUppercase]
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