I recently started learning about angularjs and am currently grasping the concept of filters. However, I have come across an issue where angularjs is calling the filter twice instead of once as expected. I'm quite puzzled by this behavior and unsure why it's happening.
If you'd like to take a look, here's the link to my plunker...
If my interpretation is correct, it seems like this question has already been discussed here
AngularJS operates using a 'dirty-check' method, which requires calling all filters to detect any changes. Once a change is detected in one variable (the one you input), AngularJS recalculates all the filters to check for additional changes.
For more detailed insight, refer to this question on Stack Overflow answered by an AngularJS expert.
Here is another Plunker demonstrating filter being called twice
The initial call comes from the watchers detecting the initial change. If there is indeed a change, they need to be called again to check for any further changes since a watcher can trigger modifications.
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