FillWithExtensible 填充数组中的元素并在需要时扩展数组长度.

Filter function creates a new array with all elements that pass the test implemented by the provided function.

indexOf 函数在切片中查找元素的索引，支持从指定索引开始查找.

will panic.

InsertSafe function inserts an element at the given index or at the nearest valid position.

Map function with named return value.

NewIterator creates a new iterator for a slice.

Reduce function with named return value.

Entry represents a key-value pair.

Iterator represents a slice iterator.