No, like an array element (
$array[$n]) the accessor of a hash element (
$hash{'foo'}) is also an lvalue (basically you can assign a value to it). This method of accessing or modifying one value at a time doesn't affect the rest of the hash.
You can also modify several elements at once using a hash slice, for example
@hash{'foo','bar','baz'} = (1,2,3);
Only when you say %hash are you definitely effecting the entire hash.
%hash = ('foo',1,'bar',2'baz',3); # whole hash overwritten
$hash{foo} = 1; # only one element created or modified
@hash{@array} = (1,2,3); # only elements specified in @array overwritt
+en, or created.
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