$Lstr Left: Difference between revisions
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<span class="pageSubtitle">Leftmost characters of a longstring</span> | <span class="pageSubtitle">Leftmost characters of a longstring</span> | ||
<p class="warn"><b>Note: </b> | <p class="warn"><b>Note: </b>Many $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $Lstr_Left function is the <var>[[Left (String function)|Left]]</var> function.</p> | ||
This function takes a string or longstring input and produces the leftmost characters of the input, possibly padded to an indicated length. | This function takes a string or longstring input and produces the leftmost characters of the input, possibly padded to an indicated length. | ||
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==Products authorizing {{PAGENAMEE}}== | ==Products authorizing {{PAGENAMEE}}== | ||
<ul class="smallAndTightList"> | <ul class="smallAndTightList"> | ||
<li>[[Sirius functions]]</li> | <li>[[List of $functions|Sirius functions]]</li> | ||
<li>[[Fast/Unload User Language Interface]]</li> | <li>[[Fast/Unload User Language Interface]]</li> | ||
<li>[ | <li>[[Media:JoclrNew.pdf|Janus Open Client]]</li> | ||
<li>[ | <li>[[Media:JosrvrNew.pdf|Janus Open Server]]</li> | ||
<li>[[Janus Sockets]]</li> | <li>[[Janus Sockets]]</li> | ||
<li>[[Janus Web Server]]</li> | <li>[[Janus Web Server]]</li> | ||
<li>Japanese functions</li> | <li>Japanese functions</li> | ||
<li>[ | <li>[[Media:SirfieldNew.pdf|Sir2000 Field Migration Facility]]</li> | ||
</ul> | </ul> | ||
[[Category:$Functions|$Lstr_Left]] | [[Category:$Functions|$Lstr_Left]] | ||
Latest revision as of 22:52, 20 September 2018
Leftmost characters of a longstring
Note: Many $functions have been deprecated in favor of Object Oriented methods. The OO equivalent for the $Lstr_Left function is the Left function.
This function takes a string or longstring input and produces the leftmost characters of the input, possibly padded to an indicated length.
The $Lstr_Left function accepts three arguments and returns a string result.
The first argument is an arbitrary string or longstring. This is a required argument.
The second argument is a number between 1 and 2**31-1 that indicates the result length. This is a required argument.
The third argument is a string containing a single character to be used as the pad character if the result length is longer than the string specified by argument one. This is an optional argument and defaults to a blank.
Syntax
%result = $Lstr_Left(longstring, len, pad)
%result is the leftmost characters of the input longstring, padded with the pad character if necessary.
Usage notes
- $Lstr_Left acts very much like $PADR except
- The target length and pad character arguments are reversed.
- It cancels the request if the result target is too short to hold the result.
- It cancels the request if the pad character argument is longer than one byte.
- It can operate on LONGSTRING inputs.
- It produces a LONGSTRING output.
Examples
- To set %BIG to "Vol":
%BIG = $Lstr_Left('Voldemort', 3)
- To set %BIG to "Snape" followed by 295 exclamation marks:
%BIG = $Lstr_Left('Snape', 300, '!')