needs -- read Macaulay 2 commands if necessary

needs -- read Macaulay 2 commands if necessary

needs "f" -- loads the file named f if it hasn't been loaded yet.

See also:

load -- read Macaulay 2 commands

Code:

     -- ../../../Macaulay2/m2/setup.m2:214
     needs = s -> if not loaded#?s then load s