Practical tips for in-depth understanding of the built-in methods of the Go language

Title: In-depth understanding of practical skills for built-in methods in Go language

When learning and using Go language (Golang), in-depth understanding of practical skills for built-in methods will help We make better use of language features to improve code efficiency and readability. This article will introduce some commonly used built-in methods and illustrate their usage and function through specific code examples.

1. Slice operation method

(1) Slice copy

In Go language, you can use the built-in copy function to Slices are copied. copyThe format of the function is:

func copy(dst, src []T) int

Sample code:

package main

import "fmt"

func main() {
    s1 := []int{1, 2, 3}
    s2 := make([]int, len(s1))

    copy(s2, s1)

    fmt.Println("s1:", s1)
    fmt.Println("s2:", s2)
}

(2) Slice append element

append of the slice Method can be used to append elements at the end of the slice. Sample code:

package main

import "fmt"

func main() {
    s := []int{1, 2, 3}

    s = append(s, 4)

    fmt.Println("s:", s)
}

2. Map operation method

(1) Traverse the map

Traverse the keys in the map through the range statement value pair. Sample code:

package main

import "fmt"

func main() {
    m := map[string]int{"a": 1, "b": 2, "c": 3}

    for key, value := range m {
        fmt.Printf("Key: %s, Value: %d
", key, value)
    }
}

(2) Delete elements in the map

Use the delete function to delete the specified key-value pair in the map. Sample code:

package main

import "fmt"

func main() {
    m := map[string]int{"a": 1, "b": 2, "c": 3}

    delete(m, "a")

    fmt.Println("m after deletion:", m)
}

3. String operation method

(1) String concatenation

Use operator or fmt.Sprintf function performs string splicing. Sample code:

package main

import "fmt"

func main() {
    s1 := "Hello, "
    s2 := "Go!"

    result := s1 + s2
    fmt.Println(result)

    result2 := fmt.Sprintf("%s%s", s1, s2)
    fmt.Println(result2)
}

(2) String cutting

Use the strings.Split function to split the string. Sample code:

package main

import (
    "fmt"
    "strings"
)

func main() {
    s := "hello,world"

    parts := strings.Split(s, ",")
    fmt.Println(parts)
}

By learning and practicing the above built-in methods and techniques, we can better apply the functions provided by the Go language to optimize our code. Hopefully these examples will help you gain a deeper understanding of the use of built-in methods in the Go language.

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