red/help

For help with your code, suggestions and ideas, and learning Red.

dsunanda

@dsunanda

That is not necessarily the case - certainly not with R2's implementation of PARSE.

In the hands of experts (such as Maxim) it was often much faster than procedural code. There were many speed challenges over on the Mailing list and Altme. PARSE usually won.

Dunno if Red's PARSE is yet optimized internally - but you may be surprised by how nifty it can be.

rebred

@rebred

this removes the first 4 char of a string

how do I remove the last 4

ne1uno

@ne1uno

@rebred /tail see ? trim

Vladimir Vasilyev

@9214

@rebred perhaps you should learn about series' indexes first.

rebred

@rebred

@ne1uno remove modifies the string

how do I use trim ?

Vladimir Vasilyev

@9214

You don't need trim in your case, @ne1uno is mistaken.

amreus

@amreus

take/last/part string 4?

nedzadarek

@nedzadarek

@ne1uno trim deletes spaces or list of characters. I am not sure how you can delete N elements from tail using this.

Vladimir Vasilyev

@9214

@rebred read this and figure out how to position your string index 4 characters before the tail. The rest is trivial.

Or use take instead, if you care about removed values.

rebred

@rebred

test: "this is a simple test"
remove/part test 3
== "s is a simple test"

nedzadarek

@nedzadarek

:clap:

amreus

@amreus

using take doesn't express quite clearly the intent I guess since you probably aren't interested in the removed values.

rebred

@rebred

I guess remove only works for trimming the beginning of the string not the end

Vladimir Vasilyev

@9214

Sigh...

>> string: "a string"
== "a string"
>> at tail string -4
== "ring"
>> clear at tail string -4
== ""
>> string
== "a st"

You can use remove/part ... 4 instead of clear if you really want.

amreus

@amreus

@rebred - @9214 is trying to tell you to look at series index...

This message was deleted

rebred

@rebred

@amreus yes I was trying to avoid doing all these steps to remove 4 chars at the tail of a string !

nedzadarek

@nedzadarek

@rebred to be precise, remove and some other functions works from the current position, e.g. s: "abcdef" (s2: at s 2) (remove/part s2 3) probe s ; "aef"... but Vladimir already posted you link about this.

rebred

@rebred

str: "this is $ simple test"
find/tail str "$"
== " simple test"

is there a way instead of getting the string on the right of the $ I can get the string on the left ?

Vladimir Vasilyev

@9214

You're already getting the string on the right.

rebred

@rebred

yes sorry @9214

Vladimir Vasilyev

@9214

Why then do you use /tail refinement?

rebred

@rebred

str: "this is $ simple test"
find str "$"
== "$ simple test"

rebred

@rebred

I see there is a SQLite binding

https://github.com/red/code/tree/master/Library/SQLite

is there an example on how to use and configure it ?

Vladimir Vasilyev

@9214

@rebred if you'd look at this repository more closely, you'd notice that it contains 3 testing examples.

rebred

@rebred

@9214 thank you

GiuseppeChillemi

@GiuseppeChillemi

@rebred also you could use Munge.

But only on Windows Platform.

Sunnypt

@Sunnypt

how can I see what is new in each latest build of Red - I download every new build but struggle to know what's new.

Gregg Irwin

@greggirwin

We have https://progress.red-lang.org/, to summarize changes, but it's not the same as a changelog, which we hope to do more consistently in the future.

And, again, a huge thanks to @x8x for making that progress page. It's fantastic.

Sunnypt

@Sunnypt

ok, sorry - just wanted to know about new things as they are introduced

Sunnypt

@Sunnypt

i meant new functions, actions etc.

Gregg Irwin

@greggirwin

Yes, that's what a changelog will help with.

Sunnypt

@Sunnypt

thanks - so at the moment new builds appear, but who knows what new features they hold ?

Sunnypt

@Sunnypt

yes , sorry - just keen to know what's new

nedzadarek

@nedzadarek

If I have a block! I can retrieve value by:

integer! -> arr: [11 22 33] arr/1; 11
word! -> arr: [a 1 b 2] arr/b; 2
paren! -> result of the paren! can be: any-word (same as word!), integer (see above), other value (select arr 'a)

Do I miss something?

Gregg Irwin

@greggirwin

@Sunnypt you need to monitor the progress page or commits. We include big notes with big releases and blog announcements, which we hope to do much more frequently. New docs efforts ramping up as well.

@nedzadarek correct. See https://doc.red-lang.org/en/datatypes/path.html for more details. Paren values in paths are currently supported, and can be useful, but that design decision isn't frozen.

dsunanda

@dsunanda

@Sunnypt I have a toy utility that can uncover many of the differences between versions of R2, R3 and Red. Here's an example of what has changed as NATIVEs, ACTIONs and FUNCTIONs between the original 0.6.3 release of Red, and last week click here to download - you'll need to unzip.
But as Gregg says, it is generally better to track progress by what has been reported as an intentional change - rather than just by spotting what is different.

Toomas Vooglaid

@toomasv

@nedzadarek There is one more accessor: set-word!

c: [a: 1 b: 2 (y 5) 6]
y: 'a
c/:y
;== 1
y: quote (y 5)
c/:y   ; But this gets the evaluated result of parens, which is 5, so 5th element
;== (y 5)
c/(y)  ; This selects as `select/only`
;== 6

Consider also this

c: [a: 1 b: 2 (y 5) 6 x 3 x: 4]
y: quote x:
;== x:
c/:y ; Selects first x 
;== 3
c/(y) ; Also selects first x
;== 3
select/same c quote x: ; Only this selects exactly
;== 4
select/same c y
;== 4

Toomas Vooglaid

@toomasv

Er .. get-word! :flushed:

Toomas Vooglaid

@toomasv

Also

c: [a: 1 b: 2 (y 5) 6]
y: quote (quote (y 5))
c/:y
;== 6
c/(quote (y 5))
;== 6
; But
c/(y)
;== none
c/((y 5))
;== (y 5)

Semseddin Moldibi

@endo64

Good explanations @toomasv thanks!

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