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REBOL is composed by grouping values and words into blocks. Blocks are used for code, lists, arrays, tables, directories, associations, and other sequences.
A block is a type of series which is a collection of values organized in a specific order.
A block is enclosed in square brackets [ ]. Within a block, values and words can be organized in any order and can span any number of lines. The following examples illustrate the valid forms of blocks:
[white red green blue yellow orange black] ["Spielberg" "Back to the Future" 1:56:20 MCA] [ Ted email@example.com #213-555-1010 Bill firstname.lastname@example.org #315-555-1234 Steve email@example.com #408-555-4321 ] [ "Elton John" 6894 0:55:68 "Celine Dion" 68861 0:61:35 "Pink Floyd" 46001 0:50:12 ]
Blocks are used for code as well as for data, as shown in the following examples:
loop 10 [print "hello"] if time > 10:30 [send jim news] sites: [ http://www.rebol.com [save %reb.html data] http://www.cnn.com [print data] ftp://www.amiga.com [send firstname.lastname@example.org data] ] foreach [site action] sites [ data: read site do action ]
A script file itself also is a block. Although it does not include the brackets, the block is implied. For example, if the lines below were put in a script file:
red green blue yellow
When the file is loaded, it will be a block that contains the words red, green, blue, and yellow. It is equivalent to writing:
[red green blue yellow]
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