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 | Index to Current Pos | Other] |
|---|---|---|---|---|---|---|---|---|---|
| Alter | |||||||||
| Append | |||||||||
| At | Yes | ||||||||
| Back | |||||||||
| Change | Changes series from current position | Series to change | YES | ||||||
| Clear | Deletes everything from current position to tail | ||||||||
| Collect | |||||||||
| Compose | |||||||||
| Copy | Returns a copy of the series | ||||||||
| Empty? | |||||||||
| Exclude | Returns first arguments values minus second argument values | ||||||||
| Extract | |||||||||
| Find | Returns a series from the mathing position | ||||||||
| Head | |||||||||
| Head? | |||||||||
| Index? | |||||||||
| Insert | Insert a value in the current position shifting the previous value(s) to the right | ||||||||
| Last | |||||||||
| Length? | |||||||||
| Move | Move element(s) of the series to another | ||||||||
| Next | |||||||||
| Path! | |||||||||
| Path? | |||||||||
| Pick | Takes the N'th value | ||||||||
| Poke | Sets the N th value | ||||||||
| Rejoin | |||||||||
| Remove | Remove the first value of a series starting from current position | ||||||||
| Replace | Replace the found value with another one | ||||||||
| Reverse | Reverse all the arguments of a series | ||||||||
| Select | Selects (extract) the item next to the matched one | ||||||||
| Skip | Move index one or more position forward | ||||||||
| Sort | Sort the series | ||||||||
| Swap | Swap the current elements of two series | ||||||||
| Tail | |||||||||
| Tail? | |||||||||
| Take | |||||||||
| 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)
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