ЭЛЕКТРОННАЯ БИБЛИОТЕКА КОАПП |
Сборники Художественной, Технической, Справочной, Английской, Нормативной, Исторической, и др. литературы. |
5.1. Adding an Element to a HashProblemYou need to add an entry to a hash. DiscussionPutting something into a hash is straightforward. In languages that don't provide the hash as an intrinsic data type, you have to worry about overflows, resizing, and collisions in your hash table. In Perl, all that is taken care of for you with a simple assignment. If that entry was already occupied (had a previous value), memory for that value is automatically freed, just as when assigning to a simple scalar. # %food_color defined per the introduction $food_color{Raspberry} = "pink"; print "Known foods:\n"; foreach $food (keys %food_color) { print "$food\n"; } If you store In Perl's hashing algorithm, permutations of a string hash to the same spot internally. If your hash contains as keys many permutations of the same string, like See AlsoThe "List Value Constructors" section of perldata (1); the "List Values and Arrays" section of Chapter 2 of Programming Perl; Recipe 5.2 |