Question

How to use optional named parameters in function with Dart

Answer 1

void f(int x, {int y = 5}) {
    print(x);
    print(y);
}

main() {
    f(2763);
    
    print("\n");
    
    f(999, y: 1111);
}





/*
run:

2763
5


999
1111

*/

 

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Answer 2

f(String name, {String mode = "w+", String charset = 'utf-16'}) {
    print(name);
    print(mode);
    print(charset);
    print("\n");
  
}


main() {
    f('dart');
    f('java', mode: 'y+');
    f('c', charset: 'windows-1258');
    f('c++', charset: 'iso-8859-10', mode: 'v+');
    f('python', mode: 'z+', charset: 'utf-8');
}





/*
run:

dart
w+
utf-16


java
y+
utf-16


c
w+
windows-1258


c++
v+
iso-8859-10


python
z+
utf-8

*/

 

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