Double execution of the Angular customFilter function

My goal is to use a custom filter in Angular to filter an array.

Essentially, I have a binding set up like this:

{{ myData.winners | getWinnerString }}
, which returns an array of items with a length ranging from 1 to 4. If the array consists of more than one item, I want to display a specific string like "Two way tie," "Three way tie," and so on based on the length of the array. If there's only one item, I just want to display the winner as it is. Here is what I currently have:

.filter('getWinnerString', function() {
    return function(array) {
        console.log(array);
        return array;
    }
});

Upon running this code, the array gets looped through twice and logged twice. Any thoughts on why this might be happening? Additionally, any guidance on how to correctly implement this function to display the appropriate string would be highly valued, as all my previous attempts have been unsuccessful.

Answer №1

Examine the size of the array and determine the appropriate response based on the comparison.

if (winners.length === 1) {
    return winners[0]; // reveal the sole winner
} else {
    return numberString(winners.length) + " way tie";
}

Utilizing filters in angular provides a more elegant method to manipulate/filter data within the template. Consider it as a function with one parameter writeOutWinnerString(winners).

Answer №2

From my recollection, filters are triggered each time there is a $scope $digest. As your application expands, this could result in frequent execution.

I came across a helpful resource that explains how filter execution operates:

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