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<h1><a href="index.html">lib.</a>Interfaces</h1>
<p>
Interfaces are objects that specify (document) the external behavior of objects that “provide” them. An
interface specifies behavior through method definitions that specify functions and their signatures.
</p>
<p>Let's look at an example of an interface and a class implementing the interface:</p>
<script class="doctest">
class ITestable extends Interface {
reset() {}
run() {}
}
class Testable {
reset() {
print('Resetting testable object')
}
run() {
print('Running testable object')
}
}
</script>
<p>We can now check whether the promised interface methods are implemented by the class:</p>
<script class="doctest">
Doctest.expect(ITestable.implementedBy(Testable), true)
</script>
<p></p>
<h2>References</h2>
<ul>
<li><a href="https://zopeinterface.readthedocs.io">Zope Interfaces</a></li>
</ul>
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