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Angular key value pipe compareFn example

// Preserve original property order
originalOrder = (a: KeyValue<number,string>, b: KeyValue<number,string>): number => {
  return 0;
}

// Order by ascending property value
valueAscOrder = (a: KeyValue<number,string>, b: KeyValue<number,string>): number => {
  return a.value.localeCompare(b.value);
}

// Order by descending property key
keyDescOrder = (a: KeyValue<number,string>, b: KeyValue<number,string>): number => {
  return a.key > b.key ? -1 : (b.key > a.key ? 1 : 0);
}

Source: stackoverflow.com

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