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Published August 19, 2026

Exhaustive lookup tables in Jik v0.1.0-alpha.22

Jik v0.1.0-alpha.22 is now available. This release adds tables: fixed, module-level lookups that associate every enum member, or every variant tag, with a value of one declared type.

Make complete mappings explicit

A table is checked for completeness at compile time. Each key must appear exactly once, so missing, unknown, and duplicate entries are errors. There is no default entry: when an enum grows, the compiler points to every table that needs updating.

enum Signal:
    RED
    GREEN
    YELLOW
end

table SignalNames[Signal] -> String:
    RED: "red"
    GREEN: "green"
    YELLOW: "yellow"
end

table Durations[Signal] -> int:
    RED: 30
    GREEN: 25
    YELLOW: 5
end

table NextSignal[Signal] -> Signal:
    RED: Signal.GREEN
    GREEN: Signal.YELLOW
    YELLOW: Signal.RED
end

func main():
    signal := Signal.RED

    for cycle = 0, 6:
        println(SignalNames[signal], " for ", Durations[signal], " seconds")
        signal = NextSignal[signal]
    end
end          
        

Tables are initialized once and their entries cannot be replaced. Use them when you need to associate a value with an enum or variant tag.

Release: Jik v0.1.0-alpha.22 Docs: Tables