every method Null safety

bool every(
  1. bool test(
    1. E element
    )
)
inherited

Checks whether every element of this iterable satisfies test.

Checks every element in iteration order, and returns false if any of them make test return false, otherwise returns true.

Example:

final planetsByMass = <double, String>{0.06: 'Mercury', 0.81: 'Venus',
  0.11: 'Mars'};
// Checks whether all keys are smaller than 1.
final every = planetsByMass.keys.every((key) => key < 1.0); // true

Implementation

bool every(bool test(E element)) {
  int length = this.length;
  for (int i = 0; i < length; i++) {
    if (!test(elementAt(i))) return false;
    if (length != this.length) {
      throw ConcurrentModificationError(this);
    }
  }
  return true;
}