How to set array in golang

Golang is a statically typed programming language that supports arrays as a basic data type. An array is an ordered sequence of elements, each element has a unique index. In Golang, an array is a value type whose size is determined when declared and cannot be changed.

In Golang, the syntax for defining an array is as follows:

var arr [size]datatype

Among them, size is the size of the array, and datatype is the data type of the elements in the array. For example:

var arr [5]int

represents an array containing 5 int type elements.

We can also use array literals to initialize an array, as follows:

arr := [5]int{1, 2, 3, 4, 5}

In this way, we create an int type array containing 5 elements and initialize the array as {1, 2, 3, 4, 5}.

Of course, we can also not specify the size of the array, and the compiler will infer the size of the array based on the number of elements in the initialization list:

arr := [...]int{1, 2, 3, 4, 5}

When creating an array in this way, the compiler The compiler will infer the size of the array based on the number of elements in the initialization list, so we don't need to manually specify the size of the array.

In addition to the array initialization method introduced above, we can also access elements in the array through subscript indexing. The subscripts of the array start from 0 and increase sequentially, that is, the subscript of the first element is 0, the subscript of the second element is 1, and so on.

We can use the subscript of the array to read or modify the elements in an array, as follows:

arr := [5]int{1, 2, 3, 4, 5}
fmt.Println(arr[0])     // 输出数组的第一个元素，即1
arr[0] = 10             // 修改数组的第一个元素为10
fmt.Println(arr[0])     // 再次输出数组的第一个元素，即10

In addition, in Golang, we can also use the for loop to traverse the elements in the array Each element is as follows:

arr := [5]int{1, 2, 3, 4, 5}
for i := 0; i < len(arr); i++ {
    fmt.Println(arr[i])
}

Regarding arrays, there are some points to note:

• The array is a value type. When the array is passed to the function in the function call , will copy the value of the entire array instead of passing a pointer to the underlying array like a slice.
• The length of an array is part of the array type, so it will be illegal to assign, compare, or pass parameters between arrays of different lengths.
• Arrays are generally regarded as a low-level data structure in Golang, while slices are the more commonly used collection type.

In general, array is a very practical data type in Golang, which can be used to store an ordered, fixed number of elements. In development, you need to use arrays rationally, avoid over-reliance on arrays, and use more advanced data structures such as slicing.

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