Multitier programming: Difference between revisions

Revision as of 18:53, 4 May 2020

Revision as of 18:53, 4 May 2020

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As an example, we show an Echo client–server application: The client sends a message to the server and the server returns the same message to the client, where it is appended to a list of received messages. The application is simple and self-contained, and – despite all the limitations of short and synthetic examples – it gives us the chance to demonstrate different MT languages side by side.

ListingExample 1. Echo application in Hop.js.<syntaxhighlight lang="lisp" line="1">

service echo() {

var input = <input type="text" />

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ws.onmessage = function(event) { ws.send(event.value) }

}

</syntaxhighlight>ListingExample 2. Echo application in Links.<syntaxhighlight lang="java" line="1">

fun echo(item) server {

item

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main()

</syntaxhighlight>

ListingExample 3. Echo application in Ur/Web.<syntaxhighlight lang="sml" line="1">

fun echo (item : string) = return item