Re: Function initialization at the first call.

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Thanks. I am glad that the principle was good. For some reason I was afraid that it is inadmissible ideologically.

UPD: By the way, it would be much more convenient to make String equal to "" initially. What is the best way to check emptiness of string? 

if length(String) = 0 then ... 
if String = {} then ... 
if equal(String, {}) then ...

or something else?

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