“This is the 12th day of my participation in the Gwen Challenge in November. Check out the details: The Last Gwen Challenge in 2021.”

Write at the front 👀

Today’s focus is on arrays 🌯

Array 🥫

An Array is a fixed-length sequence of the same data type 🍖

  1. A length is part of an array and must be an integer that cannot be changed once it is defined (hence arrays are rarely used directly in Go).
  2. Each element of an array can be accessed by index subscripts ranging from 0 to the point where the array length is minus 1len( )Functions andcap( )The array_length () function returns the length and capacity of an array

Define and initialize an array 🍠

  • Grammar 👇
Define an array:varArray name [array length] Type//Type indicates the data Type, which can be any basic TypeGlobal initialization:var a [3]bool = [3]bool{true.false}    // Uninitialized element values are the default values
    var b = [5]int{1.2.3.4.5}
    var c = [...]complex64{1+2i.2+1i.30.5 I.4+2i.50.1 I.6-5i}  / / [...]. Indicates that the array length is determined by the initialization value
    var d = [5]string{3: "Stubborn horns.".4: "LZH"} // Initialize elements with index numbers
    var e = [6]float64{3.14.3.141.3.1415}
    var f = [2]struct {
		name string
		age  uint} {{Bighorn bull.18}, {"Little Horned Ox".8}}  // The last line can be left out without a commaLocal initialization: g := [4]int{1.2}           
    h := [...]string{"Nami"."Sanji"."Zero"."Luffy"}   
    i := [9]bool{2: true.4:true} 
    j := [...]struct {
        book string
        price float64
    }{
        {"Go Programming Language".55.30 }, 
        {"Go Web Programming".60.83}, // The last line must have a comma
    }
Copy the code
  • Sample 👇
package main

import "fmt"

var a [3]bool = [3]bool{true.false} // Uninitialized element values are the default values
var b = [5]int{1.2.3.4.5}
var c = [...]complex64{1 + 2i.2 + 1i.3 - 0.5 I.4 + 2i.5 - 0.1 I.6 - 5i} / / [...]. Indicates that the array length is determined by the initialization value
var d = [5]string{3: "Stubborn horns.".4: "LZH"}                                    // Initialize elements with index numbers
var e = [6]float64{3.14.3.141.3.1415}
var f = [2]struct {
	name string
	age  uint} {{Bighorn bull.18}, {"Little Horned Ox".8}} // The last line can be left out without a comma
func main(a) {
	g := [4]int{1.2}
	h := [...]string{"Nami"."Sanji"."Zero"."Luffy"}
	i := [9]bool{2: true.4: true}
	j := [...]struct {
		book  string
		price float64
	}{
		{"Go Programming Language".55.30},
		{"Go Web Programming".60.83}, // The last line must have a comma
	}
	fmt.Println(a, b, c, d, e, f)
	fmt.Println(g, h, i, j)
}

Copy the code
  • Results 👇

Second, go through the number group 🍗

1. Conventional methods 🥩

  • Sample 👇
package main

import "fmt"

func main(a) {
	animal := [...]string{"The dog 🦮"."The kitten 🐈"."The pig 🐖"."Little Rabbit 🐇"."Bighorn ox 🐂"}
	for index := 0; index < len(animal); index++ {
		fmt.Printf("animal[%d]=%s\n", index, animal[index])
	}
	fmt.Printf("There are %d animals.".len(animal))
}

Copy the code
  • Results 👇

2. For range: 🥟

  • Sample 👇
package main

import "fmt"

func main(a) {
	animal := [...]string{"The dog 🦮"."The kitten 🐈"."The pig 🐖"."Little Rabbit 🐇"."Bighorn ox 🐂"}
	for index, value := range animal {
		fmt.Printf("animal[%d]=%s\n", index, value)
	}
	fmt.Printf("There are %d animals.".len(animal))
}

Copy the code
  • Results 👇

3. Arrays can be compared 🥠

If both arrays are of the same length and type, you can compare the == and! Operators Can not compare two different types of arrays, otherwise the program will report an error 🥡

  • Sample 👇
package main

import "fmt"

var a = [3]int{1.2.3}

func main(a) {
	b := [...]int{1.2.3}
	c := [3]int{}
	fmt.Println(a == b)
	fmt.Println(a == c)
	fmt.Println(b == c)
}

Copy the code
  • Results 👇

Write it at the back 🙌

Thank you for watching ✨. If you have any questions, please point them out to 💖