MAINSAIL Language Manual, Section 35.7

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35.7. first

Figure 35–7. first
$BUILTIN COMPILETIME
INTEGER
PROCEDURE   first       (STRING s);

first returns the character code for the first character of the STRING s.

If s is "", -1 is returned. -1 is not a valid character code.

Example 35–8. Use of first
first("abc") = 'a' = 97 # assuming the ASCII character set
first("") = -1

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MAINSAIL Language Manual, Section 35.7