CODEWITHSUNDEEP
dart
マスターヨーダー
マスターヨーダー

Reputation: 85

Is there more concise way to write code with NaN condition in dart?

The cord I am in need is below:

//These two variables are double and both can be 0.0, so the result can be NaN.
(data['amount'] / totalSpending).isNaN ? 0.0 : (data['amount'] / totalSpending)

The equivalent can be achieved in Javascript, like this

data['amount'] / totalSpending || 0.0

I want to do same thing in Dart, but the || operator doesn't seem to allow other than type boolean in Dart. Do you have any solution for this?

Upvotes: 0

Views: 91

Answers (1)

jamesdlin
jamesdlin

Reputation: 90135

There's no built-in way, but you could do:

extension DefaultNaN on double {
  double defaultIfNaN(double value) => isNaN ? value : this;
}

and then you could do (data['amount'] / totalSpending).defaultIfNaN(0).

You can't override || since || has special short-circuiting behavior, but you alternatively could override | for double:

extension DefaultNaN on double {
  double operator |(double value) => isNaN ? value : this;
}

and then you could do data['amount'] / totalSpending | 0. However, I don't necessarily recommend that since I personally don't think that (or even JavaScript's || usage) is very readable, and if someone reading the code isn't already familiar with it, it's hard to search for.

Upvotes: 2

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