I have multiple ngFor in angular project use trackBy:trackByFunction with single function or create multiple function?

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trackByFunction (index, items) {
   return item.id;

}

trackByABCtList(index, item) {
        return item.id; // or item.id
    }

trackByEmployeelist(index, item) {
    return item.id; // or item.id
}

trackByTags(index, item) {
    return item.id; // or item.id
}

trackByGroup(index, item) {
    return item.id; // or item.id
}

trackByEmployeesrange(index, item) {
    return item.id; // or item.id
}

trackByDepartment(index, item) {
    return item.id; // or item.id
}

trackByFeedbackQuestion(index, item) {
    return item.id; // or item.id
}

All Function same return type item.id, SO My Question is, I need to multiple trackByFunction or it's okay use only one.

angular-directive angular javascript
1 Answers

It is ok to have one function. This functions is pure (e.g. no mutations) so it won't matter which *ngFor will be calling the function, so you can even move this function to some utils.ts file and name it something like trackById and use this function across your project.

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