Data structures · 8 minutes of curiosity

A backpack full of things.

A data structure organizes values. A list keeps a collection in order, and it can grow. Unlike one primitive value, a list can hold many values together.

Your mission: lists & collections

Create a bag list containing map, snack, and torch. Add compass to the end. Print the list’s length: 4.

Main mission: 4
▦ BLOCK LAB · made for making

Build it: choose a toolbox category, drag blocks onto the canvas, then snap instructions inside when I press Run. Drop values into matching sockets. Edit words or numbers directly on their blocks.

Waking up the blocks…

Projects are saved on this device when storage is available.

Loading the visual editor…
Inputs Try different values

Inputs give your program information. An “input” block reads a value by its exact name. Task checks use their own values.

From blocks to Python A bridge to your next adventure

Generate real Python from these blocks. The helper functions keep Bit’s messages familiar. Python has its own type rules; the Python trail explains them.

Start a fresh plan?

This replaces the blocks on this canvas. Download your project first if you want to keep a copy.

A little hint, please

Use the add-to-end block with a text compass and the value of bag. Then use length of bag.

How do I use these blocks?

Pick a category on the left to see its blocks. Drag a block onto the canvas. Instructions connect in a stack inside “when I press Run”. Rounded value blocks go into sockets. Change a field by selecting the word, number, or dropdown on the block.

Use the canvas zoom controls or Fit blocks if a stack goes out of view. Undo can bring back an accidental change. Disconnected blocks do not run. Your canvas saves here on this device.

Pack this idea for later: Lists have an order and a length. Adding an item changes the collection. Explore it in Python →

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