dart 函數調用

1.dart函數調用

dart 函數定義和c類似

 

2.代碼例子

int timesTwo(int x) {
  return x * 2;
}

// Arrow syntax is shorthand for `{ return expr; }`.
int timesFour(int x) => timesTwo(timesTwo(x));

//第一次調用爲4*2 =8 又調用一次爲8*2 爲 16

// Functions are objects.
int runTwice(int x, Function f) {
  for (var i = 0; i < 2; i++) {
    x = f(x);
  }
  return x;
}

main() {
  print("4 times two is ${timesTwo(4)}");
  print("4 times four is ${timesFour(4)}");
  print("2 x 2 x 2 is ${runTwice(2, timesTwo)}");
  print("2 x 2 x 2 x 2  is ${runTwice(4, timesTwo)}");
}
  

3.運行效果