Dart 中的生成器

// sync* functions return an iterable
Iterable geeksForGeeks(int number) sync* {
int geek = number;
while (geek >= 0) {
    // Checking for even number
    if (geek % 2 == 0) {
    // 'yield' suspends
    // the function
    yield geek;
    }
    // Decreasing the
    // variable geek
    geek--;
}
}
// Main Function
void main()
{
print("------- Geeks For Geeks --------");
print("Dart Synchronous Generator Example For Printing Even Numbers From 10 In
        Reverse Order:");
// Printing positive even numbers
// from 10 in reverse order
geeksForGeeks(10).forEach(print);
}
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// async* function(s) return an stream
Stream geeksForGeeks(int number) async* {
int geek = 0;
// Checking for every
// geek less than number
while (geek <= number) yield geek++;
// Incrementing geek
// after printing it
}
// Main Function
void main()
{
print("-------- Geeks For Geeks -----------");
print("Dart Asynchronous Generator Example For Printing Numbers Less Than 10:");
// Printing numbers less
// than or equal to 10
geeksForGeeks(10).forEach(print);
}
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-------- Geeks For Geeks -----------
Dart Asynchronous Generator Example For Printing Numbers Less Than 10:
0
1
2
3
4
5
6
7
8
9
10