Build a CLI Todo in 30 Minutes

Goal

Build a small command-line todo app with:

• add task

• list tasks

• mark done

• exit loop cleanly

This tutorial uses only core language features: fuc, maps, loops, if/elif/else, input, and strict typing.

Step 1: Program skeleton

fuc menu() -> void:
    print("1) add")
    print("2) list")
    print("3) done")
    print("4) exit")

tasks = {}
done = {}
count = 0
running = True

while running do:
    menu()
    cmd = input("> ")

Step 2: Add tasks

Store tasks by string key, using count as id.

if cmd == "1":
    text = input("task: ")
    key = str(count)
    tasks[key] = text
    done[key] = False
    count++

Step 3: List tasks

elif cmd == "2":
    if count == 0:
        print("(empty)")
    else:
        for i in range(count):
            key = str(i)
            mark = "[ ]"
            if done[key]:
                mark = "[x]"
            print(mark + " " + key + " " + tasks[key])

Step 4: Mark task done

Use in with map keys for safe lookup.

elif cmd == "3":
    idtxt = input("id: ")
    if idtxt in tasks:
        done[idtxt] = True
    else:
        print("id not found")

Step 5: Exit and unknown command

elif cmd == "4":
    running = False
else:
    print("unknown command")

Full Program

fuc menu() -> void:
    print("1) add")
    print("2) list")
    print("3) done")
    print("4) exit")

tasks = {}
done = {}
count = 0
running = True

while running do:
    menu()
    cmd = input("> ")

    if cmd == "1":
        text = input("task: ")
        key = str(count)
        tasks[key] = text
        done[key] = False
        count++
    elif cmd == "2":
        if count == 0:
            print("(empty)")
        else:
            for i in range(count):
                key = str(i)
                mark = "[ ]"
                if done[key]:
                    mark = "[x]"
                print(mark + " " + key + " " + tasks[key])
    elif cmd == "3":
        idtxt = input("id: ")
        if idtxt in tasks:
            done[idtxt] = True
        else:
            print("id not found")
    elif cmd == "4":
        running = False
    else:
        print("unknown command")

Run it with:

./ajasendiri todo.aja

Next

• Add persistence later with fs and json modules.

• Split menu/actions into a separate module and import it.