description

# firstWhere method

E firstWhere(

1. bool test(
   1. E element
   ), {
2. E orElse()?,

})
override

The first element that satisfies the given predicate `test`.

Iterates through elements and returns the first to satisfy `test`.

Example:

    final numbers = <int>[1, 2, 3, 5, 6, 7];
    var result = numbers.firstWhere((element) => element < 5); // 1
    result = numbers.firstWhere((element) => element > 5); // 6
    result =
        numbers.firstWhere((element) => element > 10, orElse: () => -1); // -1

If no element satisfies `test`, the result of invoking the `orElse` function is returned. If `orElse` is omitted, it defaults to throwing a StateError. Stops iterating on the first matching element.

## Implementation

    E firstWhere(bool test(E element), {E Function()? orElse}) {
      int length = this.length;
      for (int i = 0; i < length; i++) {
        E element = this[i];
        if (test(element)) return element;
        if (length != this.length) {
          throw ConcurrentModificationError(this);
        }
      }
      if (orElse != null) return orElse();
      throw IterableElementError.noElement();
    }