diff options
Diffstat (limited to 'doc')
| -rwxr-xr-x | doc/lset.n | 17 |
1 files changed, 11 insertions, 6 deletions
@@ -4,7 +4,7 @@ '\" See the file "license.terms" for information on usage and redistribution '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES. '\" -'\" RCS: @(#) $Id: lset.n,v 1.17 2008/07/13 23:15:23 nijtmans Exp $ +'\" RCS: @(#) $Id: lset.n,v 1.18 2008/10/06 04:25:24 kennykb Exp $ '\" .so man.macros .TH lset n 8.4 Tcl "Tcl Built-In Commands" @@ -49,9 +49,12 @@ replaced with \fInewValue\fR. This new list is stored in the variable \fIvarName\fR, and is also the return value from the \fBlset\fR command. .PP -If \fIindex\fR is negative or greater than or equal to the number +If \fIindex\fR is negative or greater than the number of elements in \fI$varName\fR, then an error occurs. .PP +If \fIindex\fR is equal to the numnber of elements in \fI$varName\fR, +then the given element is appended to the list. +.PP The interpretation of each simple \fIindex\fR value is the same as for the command \fBstring index\fR, supporting simple index arithmetic and indices relative to the end of the list. @@ -59,7 +62,8 @@ arithmetic and indices relative to the end of the list. If additional \fIindex\fR arguments are supplied, then each argument is used in turn to address an element within a sublist designated by the previous indexing operation, -allowing the script to alter elements in sublists. The command, +allowing the script to alter elements in sublists (or append elements +to sublists). The command, .CS lset a 1 2 newValue .CE @@ -71,9 +75,10 @@ replaces element 2 of sublist 1 with \fInewValue\fR. .PP The integer appearing in each \fIindex\fR argument must be greater than or equal to zero. The integer appearing in each \fIindex\fR -argument must be strictly less than the length of the corresponding -list. In other words, the \fBlset\fR command cannot change the size -of a list. If an index is outside the permitted range, an error is reported. +argument must be less than or equal to the length of the corresponding +list. In other words, the \fBlset\fR command can change the size +of a list only by appending an element (setting the one after the current +end). If an index is outside the permitted range, an error is reported. .SH EXAMPLES .PP In each of these examples, the initial value of \fIx\fR is: |