initial commit
chapter03 initial commit
fill
ex 3.6
ex 3.6
ex 3.10
ex 3.11
ex 3.12
ex 3.13
foldLeft parameter types for f swaped
ex 3.14
3.15
ex 3.15 revised
ex 3.20
ex 3.21, 3.22, 3.23
ex 3.24
ex 3.24 revised
Tree exercises