f::lambda (public, deprecated)

 f::lambda args body

Defined in packages/acs-tcl/tcl/ad-functional-procs.tcl

Deprecated. Invoking this procedure generates a warning.

The lambda function - one of the foundations of functional programming - defines an anonymous proc and returns it. This is useful if you quickly need an auxiliary function for a small task.

Examples

• map [lambda {x} {expr $x*$x}] {1 2 3 4 5}
= {1 4 9 16 25}
• zip_with [lambda {x y} {return "$x and $y"}] {1 2 3} {4 5 6}
= "1 and 4" "2 and 5" "3 and 6"

Note

Although lambda defines a proc and therefore consumes memory, executing the same lambda expression twice will just re-define this proc. Thus, there is no memory leak, if you have a lambda inside a loop. DEPRECATED: As of tcl8.5, Tcl has native support for 'lambda' provided by means of 'apply' per TIP 194. Tcllib provides a 'lambda' package with procs that make use of it.

Parameters:

args
body

See Also:

• https://www.tcl-lang.org/man/tcl/TclCmd/apply.htm

Partial Call Graph (max 5 caller/called nodes):

Testcases:

No testcase defined.

Source code:

ns_log Notice "Deprecated proc f::lambda used:\n[ad_get_tcl_call_stack]"

    proc $args.$body $args $body
    return $args.$body

XQL Not present:

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