Ceylon (programming language): Difference between revisions

Revision as of 07:17, 5 December 2015

Revision as of 17:57, 5 December 2015

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the result will be a stream of <code>&lt;Integer|Null&gt; & Object</code> elements,

which simplifies to <code>Integer</code>.

==== Functions ====

Similarly to many modern languages, Ceylon suports first class functions and higher order functions, including function types and anonymous functions <ref>{{cite web|last=King|first=Gavin|title=The Ceylon Language: 4.7 Functions |url=http://ceylon-lang.org/documentation/1.2/spec/html/declarations.html#functions|accessdate=5 December 2015}}</ref>

<source lang="ceylon">

// A top-level higher-order function using block syntax (not associated with any user-created classes)

String process(String text, String transformString(String toChange)) {

return transformString(text);

}

// A top-level function calling String.reverse in expression form.

String reverse(String text) => text.reversed;

// A function reference to String.reversed but mostly equivalent to the function above.

String(String) reverseFunctionReference = String.reversed;

// An example where the top-level function above is provided as an argument to the higher-order function above

String reversed1 = process("one", reverse);

// Any example where an anonymous function - (text) => text+text - is provided to the higher-order function above.

String reversed2 = process("one", (text) => text+text);

</source>

==== Type Inference ====