Golang 面试题与答案
相关差异对比
问题 26. What is the 'nil' value in Go, and how is it used?
'nil' is a predeclared identifier in Go representing the zero value for pointers, channels, maps, slices, and functions. It is used to represent the absence of a value or a zero value for certain types.
问题 27. Explain the purpose of the 'sync.WaitGroup' in Go.
The 'sync.WaitGroup' is used to wait for a collection of goroutines to finish executing. It helps coordinate the execution of multiple goroutines and ensures they all complete before proceeding.
问题 28. What is the difference between the 'make' and 'new' functions in Go?
'make' is used to create slices, maps, and channels, initializing and returning an initialized value. 'new' is used to allocate memory for a new value and returns a pointer to the zeroed value.
问题 29. Explain the purpose of the 'context.Context' type in Go.
'context.Context' is used for passing deadlines, cancellations, and other request-scoped values across API boundaries and between processes. It helps manage the context of a request or operation.
问题 30. What is the purpose of the 'panic' and 'recover' functions in Go?
'panic' is used to terminate a function abruptly, and 'recover' is used to regain control of a panicking goroutine. They are often used together for error handling in exceptional cases.
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