Struct

An instance is a cluster of data that represents a thing in the game, such as a character or the stage. See objects and instances for background.

With structs, you can create your own simple instances to organize data. When you need an instance that's visible on screen and has a position, you probably want an article instead.

A struct is like an array in that they both hold multiple values, but while an array is an ordered sequence, a struct is an unordered group of variables with names.

flash_vfx = {
    name: "star",
    x_offset: 10,
    y_offset: 2
}

print(flash_vfx.name)

flash_vfx.x_offset += 1

// A comprehensive example
var vfxs = [ // Array
    { name: "star", x_offset: 10, y_offset: -30},  // Of structs
    { name: "spark", x_offset: -20, y_offset: -10},
    { name: "pop", x_offset: -5, y_offset: -20},
]
for (var vfx_i = 0; vfx_i < array_length(vfxs); vfx_i += 1) { // For loop over the array
    var vfx = vfxs[vfx_i]
    draw_sprite(vfx.name, 1, vfx.x, vfx.y);  // Unpack the struct values
}

(see for loop)

Structs are sometimes called a 'lightweight object', which is misleading. Structs are instances, not objects.