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A function that can be used in Formulas.
padOrTruncateLeft$
(string$
, newWidth
[, pad$
])
pad$
) to the left of string$
, or remove characters from the left of string$
, until the result is precisely newWidth
characters long:
assert padOrTruncateLeft$ ("hello", 12, ".") = ".......hello"
assert padOrTruncateLeft$ ("hello", 3, ".") = "llo"
assert padOrTruncateLeft$ ("hello", 0) = ""
If pad$
is not given, the padding will be done with spaces:
assert padOrTruncateLeft$ ("hello", 12) = " hello"
assert padOrTruncateLeft$ ("hello", 3) = "llo"
If characters have to be added, and pad$
contains more than one character, the left edge of pad$
is left-aligned to the resulting string, so that the result will look good if padding is used for visualizing columns:
assert padOrTruncateLeft$ ("hello", 12, ".-;)") = ".-;).-;hello"
assert padOrTruncateLeft$ ("goodbye", 12, ".-;)") = ".-;).goodbye"
Note that newWidth
cannot be negative:
asserterror Can never truncate a string down to -3 characters.
a$ = padOrTruncateLeft$ ("hello", -3)
There will be an error message if padding is required but no characters are to be found in pad$
:
asserterror Empty pad string.
a$ = padOrTruncateLeft$ ("hello", 12, "")
© Paul Boersma 2024