The revised report on SCHEME, a dialect of LISP by Guy Lewis Steele

By Guy Lewis Steele

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The value for the option can be a single index or a list of indexes, where each element of the index list indicates an index in a sub-list. For example: puts [lsort -integer -index 1 {{Alpha 2} {Beta 1} {Gamma 3}}] {Beta 1} {Alpha 2} {Gamma 3} Another option is to use your own custom implementation of the comparison algorithm. To do so, you have to define a command that accepts two arguments (items from the list that is being sorted) and returns the integer value by complying to the following rules: • The value is negative when the first argument is considered to be lower than the second • The value is 0 when both arguments are considered equal • The value is a positive value when the first argument is higher than the second one [ 32 ] Chapter 1 It is illustrated in the following example: proc compareStrings {s1 s2} { return [expr {[string length $s1] - [string length $s2]}] } set animals [list snake crocodile monkey cat] puts "default: [lsort $animals]" puts "custom: [lsort -command compareStrings $animals]" We have the animals list that contains some animal names.

Dictionary: It allows us to store zero or more key-value relations, where a key can have only one value, where the value can be any valid Tcl object (including a Tcl list), accessed via dict command and its subcommands. Arrays are not first-class objects in Tcl, and therefore, are not mentioned in the list. First class objects are data that can be passed directly. They can be used in commands such as set and return. Arrays themselves are not such objects—they can be passed by their names using a command such as upvar, but it is not possible to return an array—for example, the following will not work: proc createArray {} { set value(firstValue) 1 set value(otherValue) 2 return $value } This command will fail with the error that the variable value is an array.

Ubuntu, for example, comes with a significant number of optional packages of additional software prepared by the community. Among them are of course binary compilations of Tcl. It is possible that your system already has the Tcl distribution installed, but even if not, it is extremely easy to install it, because Ubuntu will be able to suggest what packages should be installed based on the commands that these packages provide for the system. The following is a screenshot of such a situation: The user wants to execute the tclsh command to get Tcl interactive shell.

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