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';
// 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';Copyright © 2021 Codeinu
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