Agent skill
check-if-an-object-is-truthy-in-dart
Learn how to extend Dart's functionality to implement JavaScript-style "truthy" checks for easier conditional logic and value evaluations.
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npx add-skill https://github.com/rodydavis/skills/tree/main/skills/dart_truthy
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Additional technical details for this skill
- last modified
- Tue, 03 Feb 2026 20:04:34 GMT
SKILL.md
Check if an Object is Truthy in Dart
If you are coming from language like JavaScript you may be used to checking if an object is truthy.
if (true)
if ({})
if ([])
if (42)
if ("0")
if ("false")
if (new Date())
if (-42)
if (12n)
if (3.14)
if (-3.14)
if (Infinity)
if (-Infinity)
In Dart you need to explicitly check if an object is not null, true/false or determine if the value is true based on the type.
It is possible however to use Dart extensions to add the truthy capability.
extension on Object? {
bool get isTruthy => truthy(this);
}
bool truthy(Object? val) {
if (val == null) return false;
if (val is bool) return val;
if (val is num && val == 0) return false;
if (val is String && (val == 'false' || val == '')) return false;
if (val is Iterable && val.isEmpty) return false;
if (val is Map && val.isEmpty) return false;
return true;
}
This will now make it possible for any object to be evaluated as a truthy value in if statements or value assignments.
Prints the following:
(null, false)
(, false)
(false, false)
(true, true)
(0, false)
(1, true)
(false, false)
(true, true)
([], false)
([1, 2, 3], true)
({}, false)
({1, 2, 3}, true)
({a: 1, b: 2}, true)
Demo
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