30秒学会 Dart 片段 – none

Returns true if the provided predicate function returns false for all elements in a collection, false otherwise.

Use Iterable.some() to test if any elements in the collection return true based on fn.

代码实现

bool none<T>(Iterable<T> itr, bool Function(T) fn) {
  return !itr.any(fn);
}

使用样例

none([0, 1, 3, 0], (x) => x == 2); // true