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The Repeat While block

Repeat while true · in code: While Loops

What it does

Keeps running the blocks on its Repeat arrow for as long as something is true. It checks before every lap.

Use it for

When you don't know how many times: keep asking until the answer is right, keep doubling until it's big enough.

What to fill in

Keep repeating while this is true: A comparison, like guess != secret or n < 50.

Try it

Open it in the editor, press Run, then change it and run it again.

ExampleKeep doubling Try it

Start
Create n = 1
Repeat while n < 50
Repeat →
1. Change n to n * 2
back to the top for the next lap
Tell "Past 50 at last: " + n
End

It showsPast 50 at last: 64

1n = 12while n < 50:3    n = n * 24print("Past 50 at last: " + str(n))

Tips

Something inside the loop must change, or it never stops! Press Stop (or Esc) to end it yourself; B4Coder also stops a program after 10,000 steps and tells you.
If the condition is false at the very start, the loop runs zero times.

See it in use

Examples with the Repeat While block

Challenges that need it

Secret Password

Learn it in lesson 6Loops: do it again

Goes with

Repeat Count For Each