Differences between arrays in different languages ​​and Go language arrays

The difference between Go language arrays and other language arrays: Memory allocation: Go arrays allocate memory at runtime and the size can be reallocated, while other language arrays are allocated at compile time and have a fixed size. Type safety: Go arrays only hold elements of a specific type, avoiding runtime errors, while other languages ​​allow elements of different types. Underlying implementation: A Go array is a pointer to a slice, while other language arrays are contiguous blocks of memory.

The difference between arrays in different languages ​​and Go language arrays

In many programming languages, arrays are an important A data structure used to store a sequence of related elements. However, there are several key differences between arrays in Go and arrays in other languages.

Memory Allocation

In languages ​​like C and Java, arrays are allocated memory at compile time, and their size cannot be changed once declared. Arrays in the Go language allocate memory at runtime, and the size can be reallocated. This means that Go arrays are more flexible than arrays in other languages.

Type safety

In languages ​​such as C and C, an array is a variable-length array that allows to hold elements of different types. This flexibility can lead to runtime errors. Arrays in Go language are type-safe, that is, arrays can only hold elements of specific types. This eliminates the possibility of runtime errors.

Underlying implementation

In some languages, arrays are implemented as underlying contiguous blocks of memory. But in Go, an array is a pointer to a slice of actual elements. This means that the array is actually a fixed-size structure containing a pointer to a slice.

The following are some practical cases that demonstrate the difference of Go language arrays:

C language array

int arr[10]; // 声明一个长度为 10 的整数数组

Java array

int[] arr = new int[10]; // 声明一个长度为 10 的整数数组

Go language array

var arr [10]int // 声明一个长度为 10 的整数数组

Sample code:

package main

func main() {
    // 创建一个长度为 5 的整数数组
    arr := [5]int{1, 2, 3, 4, 5}

    // 修改数组中的元素
    arr[2] = 10

    // 使用 range 遍历数组
    for _, v := range arr {
        fmt.Println(v)
    }
}

Output:

1
2
10
4
5

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