"question mark in dart" Code Answer's
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dart double question mark
// This means a equals b, but if b is null then a equals 'hello'.
String a = b ?? 'hello';
// This means if b is null then set it equal to hello. Otherwise, don't change it.
b ??= 'hello';
dart double question mark
// This means a equals b, but if b is null then a equals 'hello'.
String a = b ?? 'hello';
Source: stackoverflow.com
question mark in dart
childCount: snapshot.data?.length ?? 0,
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