Source code in the applescript programming language

 set empty to {}
 set ints to {1, 2, 3}


 set any to {1, "foo", 2.57, missing value, ints}


set any to {1, "foo", 2.57, missing value, {1, 2, 3}}
set beginning of any to false
set end of any to Wednesday
return any
--> {false, 1, "foo", 2.57, missing value, {1, 2, 3}, Wednesday}


set any to {1, "foo", 2.57, missing value, {1, 2, 3}}
set any to false & any & Wednesday
--> {false, 1, "foo", 2.57, missing value, {1, 2, 3}, Wednesday}


set any to {1, "foo", 2.57, missing value, {1, 2, 3}}
item -1 of any --> {1, 2, 3}
items 1 thru 3 of any --> {1, "foo", 2.57}


set any to {false, 1, "foo", 2.57, missing value, {1, 2, 3}, Wednesday}
number 2 of any -- 2.57 (ie. the second number in the list)


set any to {false, 1, "foo", 2.57, missing value, 5, 4, 12.0, 38, {1, 2, 3}, 7, Wednesday}
integers from text 1 to list 1 of any --> {5, 4, 38}


count any -- Command.
length of any -- Property.
number of any -- Property.


count any's reals
length of any's integers


use AppleScript version "2.4" -- Mac OS 10.10 (Yosemite) or later.
use framework "Foundation" -- Allows access to NSArrays and other Foundation classes.

set myList to {1, "foo", 2.57, missing value, {1, 2, 3}} -- AppleScript list.
set myNSArray to current application's NSArray's arrayWithArray:myList -- Bridge the list to an NSArray.
set arrayLength to myNSArray's |count|() -- Get the array's length using its 'count' property.
--> 5