Main Page/RED By Topics
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 | Purpose | Input | Output | Modify Series | Modify Series Index | Record | Index to Head | Relative Index | Other] |
---|---|---|---|---|---|---|---|---|---|
Alter | |||||||||
Append | |||||||||
At | |||||||||
Back | |||||||||
Change | |||||||||
Clear | |||||||||
Collect | |||||||||
Compose | |||||||||
Copy | |||||||||
Empty? | |||||||||
Exclude | |||||||||
Extract | |||||||||
Find | |||||||||
Head | |||||||||
Head? | |||||||||
Index? | |||||||||
Insert | |||||||||
Last | |||||||||
Length? | |||||||||
Move | |||||||||
Next | |||||||||
Path! | |||||||||
Path? | |||||||||
Pick | |||||||||
Poke | |||||||||
Rejoin | |||||||||
Remove | |||||||||
Replace | |||||||||
Reverse | |||||||||
Select | |||||||||
Skip | |||||||||
Sort | |||||||||
Swap | |||||||||
Tail | |||||||||
Tail? | |||||||||
Take | |||||||||
Take | |||||||||
Union | |||||||||
Unique | |||||||||
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)
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