Difference between revisions of "F$ELEMENT()"
(Added a note and example in regards to the return value when the element doesn't exist) |
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'''Delimiter''' is the character used to delimit the elements in the string. For example, in "JAN/MAR/APR/MAY", the delimiter is "/", and in "John Doe", the delimiter is " ". | '''Delimiter''' is the character used to delimit the elements in the string. For example, in "JAN/MAR/APR/MAY", the delimiter is "/", and in "John Doe", the delimiter is " ". | ||
'''String''' is the string containing the element. | '''String''' is the string containing the element. | ||
| + | |||
| + | If the select element does not exist in the string, the delimiter character is returned. | ||
=Example= | =Example= | ||
<nowiki> | <nowiki> | ||
$ DAY_LIST = "MON/TUE/WED/THU/FRI/SAT/SUN" | $ DAY_LIST = "MON/TUE/WED/THU/FRI/SAT/SUN" | ||
| + | |||
$ MONDAY = F$ELEMENT(0,"/",DAY_LIST) | $ MONDAY = F$ELEMENT(0,"/",DAY_LIST) | ||
$ SHOW SYM MONDAY | $ SHOW SYM MONDAY | ||
MONDAY = "MON" | MONDAY = "MON" | ||
| + | |||
| + | $ EIGHTH_DAY = F$ELEMENT(7,"/",DAY_LIST) !non-existent element | ||
| + | $ SHOW SYM EIGHTH_DAY | ||
| + | EIGHTH_DAY = "/" | ||
</nowiki> | </nowiki> | ||
Revision as of 16:09, 5 September 2019
F$ELEMENT() is a lexical function that extracts one element from a string of elements. It can be used, among other things, to emulate arrays in DCL.
Format
F$ELEMENT(element-number, delimiter, string)
Element numbers range from 0 to F$LENGTH(string). Delimiter is the character used to delimit the elements in the string. For example, in "JAN/MAR/APR/MAY", the delimiter is "/", and in "John Doe", the delimiter is " ". String is the string containing the element.
If the select element does not exist in the string, the delimiter character is returned.
Example
$ DAY_LIST = "MON/TUE/WED/THU/FRI/SAT/SUN" $ MONDAY = F$ELEMENT(0,"/",DAY_LIST) $ SHOW SYM MONDAY MONDAY = "MON" $ EIGHTH_DAY = F$ELEMENT(7,"/",DAY_LIST) !non-existent element $ SHOW SYM EIGHTH_DAY EIGHTH_DAY = "/"
