IterableExt<E> extension

on

• Iterable<E>

Methods

elementAtOrNull(int index) → E?

filter(bool f(E e)) → List<E>

firstOrNull({bool f(E e)?}) → E?

forIndex(dynamic f(E e, int index)) → void

groupBy<T>(T f(E e)) → Map<T, List<E>>

按条件分组数据

joinTo(String f(E e), {String separator = ","}) → String

lastOrNull({bool f(E e)?}) → E?

mapIndex<T>(T f(int index, E e)) → List<T>

maxBy<R extends Comparable>(R f(E e)) → E?

minBy<R extends Comparable>(R f(E e)) → E?

sumBy(num f(E e)) → num

toMap<K, V>(K keySelector(E e), V valueTransform(E e)) → Map<K, V>