Return the maximum value of all items in {expr}. Example:

echo max([apples, pears, oranges])

{expr} can be a List or a Dictionary. For a Dictionary, it returns the maximum of all values in the Dictionary. If {expr} is neither a List nor a Dictionary, or one of the items in {expr} cannot be used as a Number this results in an error. An empty List or Dictionary results in zero.

Can also be used as a method:

mylist->max()