Tcl8.6.6/Tk8.6.6 Documentation > Tcl Commands, version 8.6.6 > tailcall

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NAME

SYNOPSIS

DESCRIPTION

return [uplevel 1 [list command ?arg ...?]]

This command may not be invoked from within an uplevel into a procedure or inside a catch inside a procedure or lambda.

EXAMPLE

proc factorial {n {accum 1}} {
    if {$n < 2} {
        return $accum
    }
    tailcall factorial [expr {$n - 1}] [expr {$accum * $n}]
}

Print the elements of a list with alternating lines having different indentations.

proc printList {theList} {
    if {[llength $theList]} {
        puts "> [lindex $theList 0]"
        tailcall printList2 [lrange $theList 1 end]
    }
}
proc printList2 {theList} {
    if {[llength $theList]} {
        puts "< [lindex $theList 0]"
        tailcall printList [lrange $theList 1 end]
    }
}

SEE ALSO

KEYWORDS