Dynamic scoping in action
suggest changeDynamic scoping means that variable lookups occur in the scope where a function is called, not where it is defined.
$ x=3
$ func1 () { echo "in func1: $x"; }
$ func2 () { local x=9; func1; }
$ func2
in func1: 9
$ func1
in func1: 3
In a lexically scoped language, func1
would always look in the global scope for the value of x
, because func1
is defined in the local scope.
In a dynamically scoped language, func1
looks in the scope where it is called. When it is called from within func2
, it first looks in the body of func2
for a value of x
. If it weren’t defined there, it would look in the global scope, where func2
was called from.
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