splitBefore method Null safety

Iterable<List<T>> splitBefore(
  1. bool test(
    1. T element
    )
)

Splits the elements into chunks before some elements.

Each element except the first is checked using test for whether it should start a new chunk. If so, the elements since the previous chunk-starting element are emitted as a list. Any final elements are emitted at the end.

Example: Example:

var parts = [1, 2, 3, 4, 5, 6, 7, 8, 9].split(isPrime);
print(parts); // ([1], [2], [3, 4], [5, 6], [7, 8, 9])

Implementation

Iterable<List<T>> splitBefore(bool Function(T element) test) =>
    splitBeforeIndexed((_, element) => test(element));