Printing custom types
You can define custom output for your types.
To do this, it is enough to define a str() method that returns a string.
struct Color {
r int
g int
b int
}
pub fn (c Color) str() string {
return '{${c.r}, ${c.g}, ${c.b}}'
}
red := Color{
r: 255
g: 0
b: 0
}
println(red) // {255, 0, 0}
The str() method is implicitly defined for all types, the code above overrides it for the Color
structure.
You can override it for any type, even arrays, maps, or sum types:
struct Color {
r int
g int
b int
}
pub fn (c Color) str() string {
return '{${c.r}, ${c.g}, ${c.b}}'
}
pub fn (colors []Color) str() string {
return colors.map(it.str()).join('; ')
}
colors := [Color{
r: 255
g: 0
b: 0
}, Color{
r: 0
g: 255
b: 0
}]
println(colors) // {255, 0, 0}; {0, 255, 0}