Arrays

Arrays are defined using square brackets, with items separated by commas:

[\, /\, //]

Arrays can be concatenated with the + operator:

[/, /\] + [//] is the same as [/, /\, //]

To remove items from an array, the - operator can be used with either an index or a value. When removing by value, only the first instance of each value will be removed. Trying to remove an element not present in the array will result in an error.

["a", "b", "c"] - / gives ["a", "c"]
["a", "b", "c", "d"] - ["b", "d"] gives ["a", "c"]

-- can be used instead if we want to remove elements even if they're not present in the array:

["a", "b", "c", "d"] - ["c", "d", "e"] gives ["a", "b"]

Negating an array will return its copy with duplicates removed:

-[/\\\, //, //, //\, /\\\, //, /\/] gives [/\\\, //, //\, /\/]

If we want to remove duplicates of just one value, we can use ---:

[/\\\, //, //, //\, /\\\, //, /\/] --- // gives [/\\\, //, //\, /\\\, /\/]

Set-like union, intersection, and symmetric difference can be obtained by using |, & and ^, respectively:

primes: [/\, //, /\/, ///, /\//, //\/]!;
evens: [/\, /\\, //\, /\\\, /\/\, //\\]!;

"|", primes | evens!;
"&", primes & evens!;
"^", primes ^ evens!;

[2, 3, 5, 7, 11, 13]
[2, 4, 6, 8, 10, 12]
| [2, 3, 5, 7, 11, 13, 4, 6, 8, 10, 12]
& [2]
^ [3, 5, 7, 11, 13, 4, 6, 8, 10, 12]

Arrays of integers can be cast to type String:

[//\/\\\, //\/\\/, ////\\/, //\\\\/]% gives "hiya"