_max

Produces the most of the received values -- Function

Anything -> _max (exp) -> The same Type

Receives: A List of any sort
exp (optional): An optional expression to apply to each received value
Produces: The highest of the received values

In its simple form, with no parameters, _max takes a List of values, and produces whatever is most from them:

<7, 28, 3, 5, 108> -> _min

produces 108.

The more interesting and common usage, however, takes one parameter, which is an expression. This applies the received values (usually Things) to that expression, and produces the one that had the highest result:

All Games -> _max(Price)

produces the Game with the highest Price.

You can get a similar result by using _sort and taking the last value of the results, but _max is much, much faster, and should be used instead when possible.