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JavaScript React by Example Building the Application Creating the Counter

Any reason not to just pass the function into the Counter props and not have to declare a variable on each render?

Like this:

      <Counter
        totalGuests={this.getTotalInvited()}
        guestsAttending={this.getTotalConfirmed()}
        guestsUnconfirmed={this.getTotalUnconfirmed()}
      />

1 Answer

It's because the the teacher wants to use the two constants to calculate the number of unconfirmed guests:

  const numberUnconfirmed = totalInvited - numberAttending;

He doesn't want to create a third function. It's personal preference. I like you way.