UnicodeLeft (Unicode function): Difference between revisions
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{{Template:Unicode:UnicodeLeft subtitle}} | {{Template:Unicode:UnicodeLeft subtitle}} | ||
<var>UnicodeLeft</var> returns the left-most characters of the method object string, possibly padding it on the right. | |||
==Syntax== | ==Syntax== | ||
{{Template:Unicode:UnicodeLeft syntax}} | {{Template:Unicode:UnicodeLeft syntax}} | ||
===Syntax terms=== | ===Syntax terms=== | ||
<table class="syntaxTable"> | <table class="syntaxTable"> | ||
<tr><th | <tr><th>%outUnicode</th> | ||
<td>A <var>Unicode</var> variable to receive the result of the <var>UnicodeLeft</var> method. </td></tr> | <td>A <var>Unicode</var> variable to receive the result of the <var>UnicodeLeft</var> method. </td></tr> | ||
<tr><th | |||
<tr><th>unicode</th> | |||
<td>A <var>Unicode</var> string. </td></tr> | <td>A <var>Unicode</var> string. </td></tr> | ||
<tr><th> | |||
<td>The number of the left-most characters to return. If | <tr><th>number</th> | ||
<tr><th>< | <td>The number of the left-most characters to return. If <var class="term">unicode</var> is shorter than the requested number of characters, it is either padded to the requested length or returned with no padding, depending on the value of the <var>Pad</var> parameter. </td></tr> | ||
<td> | |||
<tr><th><var>Pad</var></th> | |||
<td>A single character used to pad <var class="term">unicode</var>, on the right, if it is shorter than the requested <var class="term">number</var>. <var class="term">c</var> defaults to a null string (<tt><nowiki>''</nowiki></tt>) which means no padding is done. | |||
<p> | |||
<var>Pad</var> is a [[Notation conventions for methods#Named parameters|name required]] parameter, and <var>Pad</var> is a <var>Unicode</var> string. Like all <var>Unicode</var> arguments, if an EBCDIC string is specified, it is, converted to <var>Unicode</var>. </p></td></tr> | |||
</table> | </table> | ||
==Usage notes== | ==Usage notes== | ||
<ul> | <ul> | ||
<li>The | <li>The <var class="term">number</var> value must be a non-negative number. A negative number results in request cancellation. </li> | ||
A negative number results in request cancellation. | |||
<li>The | <li>The <var>Pad</var> parameter value must be either null or a single character. A longer value results in a compilation error. </li> | ||
A longer value results in a compilation error. | |||
<li> | <li><var>UnicodeLeft</var> is identical to <var>[[UnicodeSubstring (Unicode function)|UnicodeSubstring]]</var> with <code>1</code> as its first argument. </li> | ||
<li> | <li><var>UnicodeLeft</var> is analogous to the <var>[[Left (String function)|Left]]</var> <var>String</var> intrinsic method. </li> | ||
the <var> | |||
</ul> | </ul> | ||
==Examples== | ==Examples== | ||
<ol> | |||
The following statement displays < | <li>The following statement displays <code>Model 2</code>: | ||
<p class="code">%u is unicode initial('Model 204&#x2122;':U) | <p class="code">%u is unicode initial('Model 204&#x2122;':[[U (String function)|U]]) | ||
[[Intrinsic classes#printtext|printText]] {%u:unicodeLeft(7)} | [[Intrinsic classes#printtext|printText]] {%u:unicodeLeft(7)} | ||
</p> | |||
< | <li>The following statement displays <code>Model 204!!!</code>: | ||
The following statement displays < | |||
<p class="code">%u is unicode initial('Model 204') | <p class="code">%u is unicode initial('Model 204') | ||
printText {%u:unicodeLeft(12, pad='!')} | printText {%u:unicodeLeft(12, pad='!')} | ||
</p> | </p> | ||
The following statement gets a character translation exception | <li>The following statement gets a character translation exception because the <var>Unicode</var> character <code>&#x2122;</code> (trademark) has no EBCDIC equivalent: | ||
because the <var>Unicode</var> character < | |||
<p class="code">%u is unicode initial('Model 204&#x2122;':U) | <p class="code">%u is unicode initial('Model 204&#x2122;':U) | ||
printText {%u:unicodeLeft(10)} | printText {%u:unicodeLeft(10)} | ||
</p> | </p></ol> | ||
==See also== | ==See also== | ||
{{Template:Unicode:UnicodeLeft footer}} | {{Template:Unicode:UnicodeLeft footer}} | ||
Latest revision as of 18:31, 11 July 2017
The left-most characters of the string (Unicode class)
UnicodeLeft returns the left-most characters of the method object string, possibly padding it on the right.
Syntax
%outUnicode = unicode:UnicodeLeft( number, [Pad= c])
Syntax terms
| %outUnicode | A Unicode variable to receive the result of the UnicodeLeft method. |
|---|---|
| unicode | A Unicode string. |
| number | The number of the left-most characters to return. If unicode is shorter than the requested number of characters, it is either padded to the requested length or returned with no padding, depending on the value of the Pad parameter. |
| Pad | A single character used to pad unicode, on the right, if it is shorter than the requested number. c defaults to a null string ('') which means no padding is done.
Pad is a name required parameter, and Pad is a Unicode string. Like all Unicode arguments, if an EBCDIC string is specified, it is, converted to Unicode. |
Usage notes
- The number value must be a non-negative number. A negative number results in request cancellation.
- The Pad parameter value must be either null or a single character. A longer value results in a compilation error.
- UnicodeLeft is identical to UnicodeSubstring with
1as its first argument. - UnicodeLeft is analogous to the Left String intrinsic method.
Examples
- The following statement displays
Model 2:%u is unicode initial('Model 204™':U) printText {%u:unicodeLeft(7)}
- The following statement displays
Model 204!!!:%u is unicode initial('Model 204') printText {%u:unicodeLeft(12, pad='!')}
- The following statement gets a character translation exception because the Unicode character
™(trademark) has no EBCDIC equivalent:%u is unicode initial('Model 204™':U) printText {%u:unicodeLeft(10)}