Main Page/RED By Topics: Difference between revisions
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=== Series/Blocks ===
Selecting
Contexts▼
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)
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
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Compiling
PATHS
NONE, TRUE, EMPTY, ETC.
Active words
Natural language
PARSE
DSL
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