Main Page/RED By Topics: Difference between revisions
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| Find || Find locates characters in string when passed string || [https://stackoverflow.com/questions/54267883/how-did-find-actually-locate-a-character-in-a-string-when-it-was-passed-a-str (Stack Overflow)] |
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| Data/Code || END Separators between istructions || [https://stackoverflow.com/questions/50882365/is-there-an-optional-end-instruction-in-rebol-red-like-in-javascript/54017174#54017174 (Stack Overflow) ] |
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| Editors || List of Structured Editors from NENAD (NOT RED SPECIFIC) || [https://gitter.im/red/red?at=5c36dcfcdfe133282028302e (Gitter)] |
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| Mandelbrot FAST || Math || RED/System || Mandelbrot Generator || Full Stack Team || [https://github.com/red/code/blob/master/Scripts/mandelbrot-fast.red (GITHUB)] |
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Revision as of 23:19, 20 January 2019
Topics
Code is DATA/Data is CODE
Series/Blocks
Selecting
Select returns the value next to the matched key. It could search also for types
Simplest Select Syntax is
Select BLOCK/SERIES KEY
Example:
>> select [a b c d] 'b
== c
Now, the third one will be a block
Select returns the element
>> a: [a b [1 2 3 4] d] == [a b [1 2 3 4] d]
>> select a 'b == [1 2 3 4]
SELECT is the short form of:
>> probe first next find a 'b [1 2 3 4] == [1 2 3 4]
which could also be written as
>> probe pick next find a 'b 1 == [1 2 3 4]
Finding
>> probe next find a 'b
[[1 2 3 4] d]
== [[1 2 3 4] d]
>> a: [a b [1 2 3 4] d] 'b
== b
>> probe first next find a 'b
[1 2 3 4]
== [1 2 3 4]
>> select [a b c d] 'b
== c
>> select a 'b
== [1 2 3 4]
>> a: [a b "c1234" d]
== [a b "c1234" d]
>> select a 'b
== "c1234"
>> find a 'b
== [b "c1234" d]
(TODO: Clarify if it copies)
Table
Command | Type | Purpose | Input | Output | Modify Series | Modify Series Index | Record | Index to Head | Index to Current Pos | Other |
---|---|---|---|---|---|---|---|---|---|---|
Alter | SEARCH-SET | |||||||||
Append | MODIFY | |||||||||
At | IDX | Yes | ||||||||
Back | IDX | |||||||||
Change | MODIFY | Changes series from current position | Series to change | YES | ||||||
Clear | MODIFY | Deletes everything from current position to tail | ||||||||
Collect | ||||||||||
Compose | ||||||||||
Copy | GET | Returns a copy of the series | ||||||||
Empty? | INFO | |||||||||
Exclude | UNIONS | Returns first arguments values minus second argument values | ||||||||
Extract | GET | Get elements. Cold also see block as record of elements | ||||||||
Find | SEARCH | Returns a series from the mathing position | ||||||||
Head | IDX | |||||||||
Head? | INFO | |||||||||
Index? | INFO | |||||||||
Insert | MODIFY | Insert a value in the current position shifting the previous value(s) to the right | ||||||||
Last | IDX | |||||||||
Length? | INFO | |||||||||
Move | MODIFY | Move element(s) of the series to another | ||||||||
Next | IDX | |||||||||
Path! | ||||||||||
Path? | ||||||||||
Pick | GET | Takes the N'th value | ||||||||
Poke | SET | Sets the N th value | ||||||||
Rejoin | MODIFY | |||||||||
Remove | MODIFY | Remove the first value of a series starting from current position | ||||||||
Remove-Each | MODIFY | Test each value of the block with a contition, if test returns true, remove that value | ||||||||
Replace | SEARCH-SET | Replace the found value with another one | ||||||||
Reverse | MODIFY | Reverse all the arguments of a series | ||||||||
Select | SEARCH | Selects (extract) the item next to the matched one | ||||||||
Skip | IDX | Move index one or more position forward | ||||||||
Sort | MODIFY | Sort the series | ||||||||
Swap | MODIFY | Swap the current elements of two series | ||||||||
Tail | IDX | |||||||||
Tail? | INFO | |||||||||
Take | MODIFY | |||||||||
Take | Remove and returns on or more elements of a series | |||||||||
Union | Returns the unique elements of two series | |||||||||
Unique | REturns the unique elements of a series | |||||||||
First | ||||||||||
Second | ||||||||||
Third | ||||||||||
Fourth | ||||||||||
Fifth |
Findind
Finding a value in a series/block requires FIND It returns the block positioned at the match or (none?)
To obtain the numeric index/position you should use POS? Example: POS? FIND a 'b
Note the difference in the output between finding and selectin
When exploring RED this could led to a misunderstanding [1 2 3 4] = a block containing 1 2 3 4 1 2 3 4 = a block containing another block which contains 1 2 3 4
[1 2 3 4] the element in the third position, which is a block
[[1 2 3 4] d] the original series starting at thrid position which contains the thrird and fourth element
to get again the whole block you shoud
head a (why not a: head a)
Contexts
VID
Databases
RED/Systems
Compiling
PATHS
NONE, TRUE, EMPTY, ETC.
Active words
Natural language
PARSE
DSL
RED Code INIT
EXTERNAL Libraries
CODE MORPHING
Code internal Structure
Datatypes
Articles
Type | Description | Link |
---|---|---|
(None) |
Forums/Chats Q/A
Type | Description | Link |
---|---|---|
Find | Find locates characters in string when passed string | (Stack Overflow) |
Data/Code | END Separators between istructions | (Stack Overflow) |
Editors | List of Structured Editors from NENAD (NOT RED SPECIFIC) | (Gitter) |
Scripts/Repositories
Name | Type | RED/RED System | Description | Author | Link |
---|---|---|---|---|---|
Mandelbrot FAST | Math | RED/System | Mandelbrot Generator | Full Stack Team | (GITHUB) |
(None) |