"Arrays": Harlowe (v2.1)


Arrays are a collection of values. Each entry in an array is assigned an index, which is a number that corresponds to its position in the array. In Harlowe, and unlike in JavaScript, arrays are one-based, meaning the first element in the array is given the index 1. Arrays can be created using the (a:) or (array:) macro and assigning a variable to it: (set: $myArray to (a:)).

Specific elements in an array can be accessed by following its variable name with a possessive 's and an ordinal number referencing the index to check, ($myArray's 2nd); the final entry, $myArray's last, points to the final element. Its contents can be tested using the contains operator (e.g. (if: $myArray contains 'something')[...]), add new items using the + operator (e.g. (set: $myArray to + (a: 'something'))), and remove items using the - operator. All elements in an array can be passed to macros as separate arguments with the spread operator (...).

Live Example

Download: Live Example

Twee Code

:: StoryTitle
Arrays in Harlowe

:: init [startup]
<!-- it is always a good idea to initialize your variables, but with arrays it is particularly important -->
(set: $inventory to (a:))
(set: $chest to (a: 'a shield', 'a suit of armor'))
(set: $chestOpen to false)

:: inventory [header]
You are currently carrying: 
<!-- if the inventory contains nothing, show "nothing" -->\
(if: $inventory's length is 0)[\
    <!-- we iterate over the array and print each item -->\
    (for: each _item, ...$inventory)[\
        _item (unless: $inventory's last is _item)[, ]\

:: Start
<!-- we use the + operator and wrap the target elements in an (a:) macro to add to the array -->\
You find yourself inside a small room. In the corner, you see a sword, and decide to pick it up.

(set: $inventory to it + (a: 'a sword'))\

:: hallway
You see a chest here in the hallway.  \
(unless: $chestOpen)[\
    Do you want to open it?

    (link: 'Open the chest.')[
        <!-- adding to arrays together can also be done with the + operator -->
        (set: $inventory to it + $chest)
        (set: $chestOpen to true)
        (goto: 'chest')
    It's open, and there's nothing inside.

[[Move on.|dart trap]]

:: chest
You open the chest and find (for: each _item, ...$chest)[\
    _item (unless: $chest's last is _item)[ and ]\

(link: 'Okay')[ (goto: (history:)'s last) ]

:: dart trap
Several darts shoot out of a wall at you!
<!-- we can check to see if the player has a given item with the contains operator -->
(if: $inventory contains 'a shield')[\
    Luckily, your shield will protect you.
    With no way to defend yourself, you die.

Download: Twee Code

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