any and every

Learn condition checks with any and every.

any and every

any and every query elements in a collection. any checks whether at least one element satisfies a condition; every checks whether all elements do. Both return a bool.

Example: [1, 2, 3].any((n) => n > 2) returns true because 3 satisfies it. [1, 2, 3].every((n) => n > 0) returns true because all are positive.

These methods are used for decisions. For example they answer whether there is at least one active user or whether all products are in stock.

Using any and every

These methods are often used in if conditions. any queries the existence of something; every queries whether a property holds for all.

Example: if (cart.any((p) => p.inStock)) print('In stock item found');. Or if (students.every((s) => s.passed)) print('All passed');.

These queries are shorter and more readable than writing a loop. They show the power of the Dart collection API.

Exercise Query with any and every

On the list [1, 2, 3, 4, 5] query whether there is an even number with any((n) => n.isEven) and print it. On the same list query whether all are positive with every((n) => n > 0) and print it.

Show example solution

void main() {
  var numbers = [1, 2, 3, 4, 5];
  var hasEven = numbers.any((n) => n.isEven);
  var allPos = numbers.every((n) => n > 0);
  print(hasEven);
  print(allPos);
}

Test yourself

The any call

var numbers = [1, 2, 3];
var has = numbers.____((n) => n > 2);

Show answer

var numbers = [1, 2, 3];
var has = numbers.any((n) => n > 2);

What does [1, 2, 3].every((n) => n > 5) return?
```
var r = [1, 2, 3].every((n) => n > 5);
```
- true
- It throws
- false
- 3
Show answer

false — no element is greater than 5 so it returns false.
Match any and every

any(...)

Does at least one satisfy
every(...)

Do all satisfy
true

Condition met
false

Condition not met

Next lesson: Summary - Collection methods

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