5.1. Adding an Element to a Hash5.1.2. SolutionSimply assign to the hash key: $HASH{$KEY} = $VALUE; 5.1.3. 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"; } Known foods: Banana Apple Raspberry Carrot Lemon If you don't want to overwrite an existing value, but somehow have one key reference multiple values, see Recipe 5.8 and Recipe 11.2. 5.1.4. See AlsoThe "List Value Constructors" section of perldata(1); the "List Values and Arrays" section of Chapter 2 of Programming Perl; Recipe 5.2 Copyright © 2003 O'Reilly & Associates. All rights reserved. |
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