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[REBOL] Re: Q: Functions and the visibility of words

From: rgombert:essentiel at: 25-Apr-2001 12:14

You can use local words by asking for it (cf example at the bottom) with /local un the argument block or with a USE inside the body... so it's possible to avoid side effects. The way a language treat "locality" is just a choice. In PHP, variables are all locals to function... unless you ask them to be "global". In rebol it's the opposite. It should't be a problem since we know the way it work. It's certainly less difficult to understand for the begginer than the (any-blocks) words vs standard variables behavior. Renaud
>> a: func [a /local b][z: b: a] >> >> a 1.618
== 1.618
>> >> z
== 1.618
>> >> b
** Script Error: b has no value ** Near: b
>> >> a
** Script Error: a is missing its a argument ** Near: a