27_String_Functions.vim

echom strlen("foo")

echom len("foo")

echo split("one two three")

echo split("one,two,three",",")
echo join(["foo","bar"],"...")

echo join(split("foo bar"),";")

echo tolower("Foo")
echo toupper("Foo")


"Exercises
echo split('1 2')
echo split('1,,,2', ',')