title = Parallelism
cards = checkout commit-auto

[description]

Did you know that creating parallel timelines is perfectly legal and safe? It's true!

Can you find out when things went wrong in this zoo, and create a parallel universe where everyone is happy?

[setup]

echo "x = 500
y = 100" > lion

echo "x = 100
y = 100" > child
git add .
git commit -m "The beginning"

echo "x = 150
y = 100" > lollipop
git add .
git commit -m "The child buys something"

echo "x = 400
y = 100" > child
git add .
git commit -m "The child climbs somewhere"

git rm child
#echo "Looks happy. :)" > lion
git add .
git commit -m "Oh no"

echo "x = 450
y = 100" > lion
git add .
git commit -m "Nap time!"

git checkout --detach
git branch -d main

[win]

# Is the child still there, and is the lion not hungry?
{ git ls-tree --name-only -r HEAD | grep child; } && { git show HEAD:lollipop | grep "x = 4"; }

[congrats]

Whew, good job! This seems like a *much* better outcome.

Feel free to add more parallel timelines, or make them longer.

If you're ready, our next mission is already waiting...