Main Page/RED By Topics

Topics

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	MODIFY
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-SET	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	IDX	Returns a series from the mathing position
Head	IDX
Head?	IDX
Index?	IDX
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
Replace	MODIFY	Replace the found value with another one
Reverse	MODIFY	Reverse all the arguments of a series
Select	GET-SET	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