Respond to an unknown method call: Difference between revisions

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(format nil "Do something to ~w." thing))</lang>

Evaluating <lang lisp>(list (do-something 3) (do-something 4))</lang> produces

Evaluating<lang lisp>(list (do-something 3) (do-something 4))</lang> produces

<lang lisp

<lang lisp>("Do something to 3."

>("Do something to 3."

"No method for #<STANDARD-GENERIC-FUNCTION DO-SOMETHING 214FC042> on (4).")</lang>

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=={{header|OCaml}}==

It is not possible in OCaml to call an undefined method, it will fail when trying to compile the code with an error message:

Error: This expression has type example

<lang ocaml>Error: This expression has type example

It has no method ding

It has no method ding</lang>

=={{header|Perl}}==

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Here is an example of unknown methods being used to call shell commands (this is already defined in the base image):

<lang slate>define: #shell &builder: [lobby newSubSpace].

define: #shell &builder: [lobby newSubSpace].

_@shell didNotUnderstand: message at: position

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ifFalse: [args do: [| :arg | command ; ' ' ; arg]]]]] writingAs: String)

ifNil: [resend] ifNotNilDo: [| :cmd | [Platform run: cmd]]]

].

].</lang>

</lang>

Here is an example of it being used:

<lang slate>slate[1]> shell ls: '*.image'.

slate[1]> shell ls: '*.image'.

kernel.new.little.64.1244260494374694.image slate2.image

net.image slate.image

True

slate[2]>

slate[2]></lang>

</lang>

=={{header|Smalltalk}}==