What is the difference between any() and every() in Dart?

Overview

In Dart, the any() and every() methods have the same syntax and are used to check the items in a list that satisfy a given condition. However, these methods work differently.

The any() method checks if at least one item in the List satisfies the given condition. any() returns a boolean value depending on the condition. In comparison, the every() method checks if all the items in the List satisfy the given condition. every() returns a boolean value depending on the condition.

any() syntax

bool any(bool test(E element));

every() syntax

bool every(bool test(E element));

Code

The following code demonstrates how to use the any() and every() methods in Dart.

void main(){
  // Creating list
  List numbers = [9, 5, 8, 17, 11, 15, 23];
  // Using any()
  // verify if at least one item in the list is greater than 7
  if (numbers.any((item) => item > 7)) {
    // Print result
    print('At least one number > 7 in the list');
  }
  // Using every()
  // Checks if all items in the list is less than 4
 // stores a boolean value
 // depending on the condition
  var flag = numbers.every((e) => e<4);
 // display result 
  if (flag) {
    print("All items are smaller than 4");
  } else {
    print("All items are greater than 4");
  }
}

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