Iterable.every in Dart

The Iterable.every method is a useful way to determine whether all elements in an iterable satisfy a condition. This method returns true if every element in the iterable satisfies the provided condition, and it returns false otherwise.

Syntax

The syntax of using Iterable.every in Dart is as follows:

bool every(bool test(E element))

Here, test is a function that will take an element of the iterable as input and return a bool. This function must be supplied.

Example

Consider the following example to understand how Iterable.every works in Dart:

void main() {
  List<int> numbers = [1, 2, 3, 4, 5];
  bool areAllEven = numbers.every((number) => number % 2 == 0);
  print(areAllEven); // false
}

In this example, we define a List of integers named numbers. We then call the every method on this list and supply a function as an argument. This function checks whether each element in the list is even or not. Since there is at least one odd number in the list, the every method returns false.

Conclusion

In conclusion, Iterable.every is a useful method in Dart that allows you to quickly determine whether all elements in an iterable satisfy a condition. By supplying a function that checks the condition, you can efficiently check whether a list or other iterable contains elements that meet a certain requirement.