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/Adding False Functionality to Filtering
Adding False Functionality to Filtering
Learn how to extend a generic filter function to explicitly sort by truthy or falsy values.
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So far, our function explicitly filters on properties that return a truthy value. But, what if we want the opposite behavior, specifically filtering for properties that are falsy? For example, we might be maintaining a data type similar to IWidget and want to find widgets that don’t have a title or description.
Let’s extend our genericFilter function to handle this use case. Similar to how we added a descending and ascending flag to genericSort, we’ll need to include an isTruthySelected flag to genericFilter, which will trigger the opposite behavior of our existing function. Again, filtering adds additional complexity. Unlike the isDescending global flag we could pass to genericSort ...