Added docs

1 files changed, 52 insertions, 1 deletions

diff --git a/doc/array.n b/doc/array.n
index d6d4dff..bbfcd9f 100644
--- a/doc/array.n
+++ b/doc/array.n
@@ -5,7 +5,7 @@
 '\" See the file "license.terms" for information on usage and redistribution
 '\" of this file, and for a DISCLAIMER OF ALL WARRANTIES.
 '\"
-.TH array n 8.3 Tcl "Tcl Built-In Commands"
+.TH array n 8.7 Tcl "Tcl Built-In Commands"
 .so man.macros
 .BS
 '\" Note:  do not modify the .SH NAME line immediately below!
@@ -36,6 +36,53 @@ with an empty name, since the return value from
 \fBarray nextelement\fR will not indicate whether the search
 has been completed.
 .TP
+\fBarray default \fIsubcommand arrayName args...\fR
+.VS TIP508
+Manages the default value of the array. Arrays initially have no default
+value, but this command allows you to set one; the default value will be
+returned when reading from an element of the array \farrayName\fR if the read
+would otherwise result in an error. Note that this may cause the \fBappend\fR,
+\fBdict\fR, \fBincr\fR and \fBlappend\fR commands to change their behavior in
+relation to non-existing array elements.
+.RS
+.PP
+The \fIsubcommand\fR argument controls what exact operation will be performed
+on the default value of \fIarrayName\fR. Supported \fIsubcommand\fRs are:
+.VE TIP508
+.TP
+\fBarray default exists \fIarrayName\fR
+.VS TIP508
+This returns a boolean value indicating whether a default value has been set
+for the array \fIarrayName\fR. Returns a false value if \fIarrayName\fR does
+not exist. Raises an error if \fIarrayName\fR is an existing variable that is
+not an array.
+.VE TIP508
+.TP
+\fBarray default get \fIarrayName\fR
+.VS TIP508
+This returns the current default value for the array \fIarrayName\fR.  Raises
+an error if \fIarrayName\fR is an existing variable that is not an array, or
+if \fIarrayName\fR is an array without a default value.
+.VE TIP508
+.TP
+\fBarray default set \fIarrayName value\fR
+.VS TIP508
+This sets the default value for the array \fIarrayName\fR to \fIvalue\fR.
+Returns the empty string. Raises an error if \fIarrayName\fR is an existing
+variable that is not an array, or if \fIarrayName\fR is an illegal name for an
+array. If \fIarrayName\fR does not currently exist, it is created as an empty
+array as well as having its default value set.
+.VE TIP508
+.TP
+\fBarray default unset \fIarrayName\fR
+.VS TIP508
+This removes the default value for the array \fIarrayName\fR and returns the
+empty string. Does nothing if \fIarrayName\fR does not have a default
+value. Raises an error if \fIarrayName\fR is an existing variable that is not
+an array.
+.VE TIP508
+.RE
+.TP
 \fBarray donesearch \fIarrayName searchId\fR
 This command terminates an array search and destroys all the
 state associated with that search.  \fISearchId\fR indicates
@@ -194,3 +241,7 @@ foreach color [lsort [\fBarray names\fR colorcount]] {
 list(n), string(n), variable(n), trace(n), foreach(n)
 .SH KEYWORDS
 array, element names, search
+.\" Local variables:
+.\" mode: nroff
+.\" fill-column: 78
+.\" End: