What do you understand about optionals in ios Swift? What is the problem which they solve?

What do you understand about optionals in ios Swift? What is the problem which they solve?

题目类型: 技术面试题

这是一道技术面试题，常见于澳洲IT公司面试中。

难度: hard

标签: interviewbit, swift, topic-specific, ios

参考答案摘要

An optional, in ios Swift, allows any type of variable to reflect a lack of value. The absence of value in Objective C is only available in reference types that use the nil special value. This is not ...

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