面试题与答案

Golang, also known as Go, is a statically typed, compiled programming language designed for simplicity and efficiency.

The 'init' function is used to perform one-time initialization tasks, and it is executed automatically before the 'main' function.

Arrays have a fixed size, while slices are dynamically sized and more flexible. Slices are built on top of arrays and provide more functionality.

The 'defer' keyword is used to schedule a function call to be run after the surrounding function completes. It is often used for tasks like cleanup operations.

A pointer is a variable that stores the memory address of another variable. It allows indirect access to the value stored in that memory address. A value is the actual data stored in a variable.

The 'new' keyword in Go is used to allocate memory for a new variable or object. It returns a pointer to the newly allocated memory.

In Go, errors are values. Functions return an error value to indicate success or failure. It's a common practice to check for errors explicitly, making the code more robust.

The 'defer' statement is used to ensure that a function call is performed later in a program's execution, usually for purposes such as cleanup or releasing resources.

A 'map' in Go is an unordered collection of key-value pairs, while a 'slice' is an ordered sequence of elements. Maps are used for lookups based on keys, while slices are used for ordered data.

Arrays have a fixed size defined at compile-time, while slices are dynamic and can change in size during runtime. Slices are built on top of arrays and offer more flexibility.

The 'range' keyword is used in for loops to iterate over items in an array, slice, map, channel, or string. It simplifies the code for iterating over elements.

Anonymous functions, also known as function literals, are functions without a name. They can be defined and invoked inline, making them useful for short-lived and one-time-use functions.

'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.