kidsPancakes and waiting lines.
A stack takes the last added item first, like pancakes taken from the top. A queue takes the first added item first, like friends waiting for a slide. We can model both with a list.
Your mission: stacks & queues
Make a list red, blue, green. Take and print the last item, then take and print the first item, then print the remaining length. Output: green, red, 1.
Main mission: green → red → 1Build 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.
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.
A little hint, please
Use two take blocks inside say blocks: last first, then first. The variable watcher will show the list shrinking.
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.
An independent Kids Code playground, built with Blockly. No accounts or uploads. Projects stay in this browser unless you download them.