SortBy¶

Sorts elements of a list according to a function.

$ wo 'SortBy[{3, 1, 2}, # &]'
{1, 2, 3}

A list of functions sorts by each criterion in turn.

$ wo 'SortBy[{1, 2, 3, 4}, {Mod[#, 2] &, # &}]'
{2, 4, 1, 3}

A third argument orders the criterion values with a comparison function instead of canonically.

$ wo 'SortBy[{{1, 2}, {3, 1}, {2, 5}}, Last, Greater]'
{{2, 5}, {1, 2}, {3, 1}}