()
(list::list)
Category List
Type Reporter
Introduced in 1.3
This article is about the list block. For the variables block used to report variable values, see () (Variables block).


The () block is a List block and a Reporter block. The block simply reports the items of its list as a string.

Whenever a list is created, a version of the block appears with the list's name on it; this results in a version of this block for every list.

If all of the items in a list are single characters, nothing is put between the items.[note 1] Otherwise, a space is put between each pair of items.

This block can be displayed as a Stage monitor, but the monitor will show the items in the list on separate lines, instead of all together.

Example Uses

The List reporter block is used infrequently;[citation needed] most information needed can be accessed by using other reporters for the list. However, here are a couple uses for this block.

Some common uses for the () block:

  • Join separate characters/words together:
say (sentence::list)
  • Setting a variable to the value of this block so that a list local to a sprite can be transferred:
set [unlock v] to (list::list)

Workaround

Main article: List of Block Workarounds

This block can be replicated with the following code:

set [count v] to [0]
set [all are 1 v] to [true]
repeat until <<(all are 1) = [false]> or <(count) > (length of [list v])>>
change [count v] by (1)
if <(length of (item (count) of [list v])) > [1]> then
set [all are 1 v] to [false]
end
end
if <(all are 1) = [true]> then
set [report v] to []
set [count v] to [0]
repeat (length of [list v])
change [count v] by (1)
set [report v] to (join (report) (item (count) of [list v]))
end
else
set [report v] to (item (1 v) of [list v])
set [count v] to [1]
repeat ((length of [list v]) - (1))
change [count v] by (1)
set [report v] to (join (report) (join [] (item (count) of [list v])))
end
end

Bugs

Due to the nature of the Scratch interface, it was possible to create an input on a List block by entering %m, %n, or %s. This was patched in v423.

Before Scratch 3.0 was released, lists weren't able to be renamed, even though variables could be.

Entering
%m, %n, or %s will create the cor­re­spond­ing input in the () block.

Notes

  1. If any items are numbers added by a Reporter Block, à la add ((2) + (0)) to [list v], rather than a constant value, like add [2] to [list v], then there will be spaces between the values even if all of the numbers are single-digit numbers. See: https://github.com/LLK/scratch-gui/issues/6538

See Also

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