Map change all in Dart

In Dart, you can change all elements of an array using a looping construct such as for loop or forEach() method. Here are some examples to demonstrate the process:

1. Using a for loop:

void main() {
  List numbers = [1, 2, 3, 4, 5];
  for (int i = 0; i < numbers.length; i++) {
    numbers[i] = numbers[i] * 2;
  }
  print(numbers); // Output: [2, 4, 6, 8, 10]
}

In this example, we have initialized an array numbers with five integer values. We then iterate over each element of the array using a for loop. Inside the loop, we multiply current element by 2 and assign it to the same position in the array. Finally, we print the modified array numbers.

2. Using forEach() method:

void main() {
  List numbers = [1, 2, 3];
  numbers.forEach( (element) => element *= 10 );
  print(numbers); // Output: [10, 20, 30]
}

Here, we have initialized an array numbers with three integer values. We then call the forEach() method on the array and pass a lambda function as argument. The lambda function takes each element of the array, multiplies it by 10, and assigns the new value to the same position in the array. Finally, we print the modified array numbers.

Both approaches produce the same output. You can use any of these methods as per your preference and use case.