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Commit b1e22c3

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updated code
1 parent 4ce9f18 commit b1e22c3

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11 files changed

+353
-0
lines changed

11 files changed

+353
-0
lines changed

‎15-sorting/custom-sorting-struct.go

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package main
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import (
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"fmt"
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"sort"
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)
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type User struct {
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Name string
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Age int
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}
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type UsersByAge []User
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func (u UsersByAge) Len() int {
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return len(u)
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}
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func (u UsersByAge) Swap(i, j int) {
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u[i], u[j] = u[j], u[i]
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}
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func (u UsersByAge) Less(i, j int) bool {
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return u[i].Age < u[j].Age
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}
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func main() {
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users := []User{
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{
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Name: "Rajeev",
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Age: 28,
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},
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{
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Name: "Monica",
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Age: 31,
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},
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{
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Name: "John",
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Age: 56,
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},
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{
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Name: "Amanda",
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Age: 16,
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},
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{
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Name: "Steven",
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Age: 28,
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},
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}
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// Sorting a slice of users by age
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sort.Sort(UsersByAge(users))
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fmt.Println("Sorted users by age: ", users)
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// Sorting a slice of strings in the reverse order of length
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sort.Stable(UsersByAge(users))
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fmt.Println("[Stable] Sorted users by age: ", users)
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}

‎15-sorting/reverse-sorting.go

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package main
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import (
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"fmt"
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"sort"
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)
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func main() {
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// Sorting a slice of Strings
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strs := []string{"quick", "brown", "fox", "jumpes"}
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sort.Sort(sort.Reverse(sort.StringSlice(strs)))
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fmt.Println("Sorted strings in reverse order: ", strs)
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// Sorting a slice of Integers
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ints := []int{56, 19, 78, 67, 14, 25}
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sort.Sort(sort.Reverse(sort.IntSlice(ints)))
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fmt.Println("Sorted integers in reverse order: ", ints)
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// Sorting a slice of Floats
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floats := []float64{176.8, 19.5, 20.8, 57.4}
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sort.Sort(sort.Reverse(sort.Float64Slice(floats)))
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fmt.Println("Sorted floats in reverse order: ", floats)
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}

‎15-sorting/sorting-by-comparator.go

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package main
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import (
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"fmt"
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"sort"
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)
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func main() {
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// Sorting a slice of strings by length
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strs := []string{"United States", "India", "France", "United Kingdom", "Spain"}
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sort.Slice(strs, func(i, j int) bool {
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return len(strs[i]) < len(strs[j])
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})
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fmt.Println("Sorted strings by length: ", strs)
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// Stable sort
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sort.SliceStable(strs, func(i, j int) bool {
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return len(strs[i]) < len(strs[j])
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})
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fmt.Println("[Stable] Sorted strings by length: ", strs)
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// Sorting a slice of strings in the reverse order of length
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sort.SliceStable(strs, func(i, j int) bool {
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return len(strs[j]) < len(strs[i])
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})
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fmt.Println("[Stable] Sorted strings by reverse order of length: ", strs)
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}
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package main
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import (
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"fmt"
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"sort"
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)
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type User struct {
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Name string
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Age int
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}
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func main() {
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// Sorting a slice of structs by a field
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users := []User{
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{
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Name: "Rajeev",
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Age: 28,
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},
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{
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Name: "Monica",
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Age: 31,
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},
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{
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Name: "John",
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Age: 56,
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},
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{
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Name: "Amanda",
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Age: 16,
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},
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{
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Name: "Steven",
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Age: 28,
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},
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}
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sort.Slice(users, func(i, j int) bool {
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return users[i].Age < users[j].Age
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})
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fmt.Println("Sorted users by age: ", users)
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// Stable sort
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sort.SliceStable(users, func(i, j int) bool {
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return users[i].Age < users[j].Age
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})
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fmt.Println("Sorted users by age: ", users)
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}

‎15-sorting/sorting.go

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package main
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import (
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"fmt"
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"sort"
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)
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func main() {
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// Sorting a slice of Strings
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strs := []string{"quick", "brown", "fox", "jumpes"}
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sort.Strings(strs)
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fmt.Println("Sorted strings: ", strs)
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// Sorting a slice of Integers
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ints := []int{56, 19, 78, 67, 14, 25}
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sort.Ints(ints)
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fmt.Println("Sorted integers: ", ints)
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// Sorting a slice of Floats
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floats := []float64{176.8, 19.5, 20.8, 57.4}
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sort.Float64s(floats)
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fmt.Println("Sorted floats: ", floats)
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}
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package main
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import (
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"flag"
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"fmt"
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"strings"
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)
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type hobbies []string
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func (h *hobbies) String() string {
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return fmt.Sprint(*h)
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}
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func (h *hobbies) Set(value string) error {
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for _, hobby := range strings.Split(value, ",") {
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*h = append(*h, hobby)
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}
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return nil
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}
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func main() {
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// Declare a string flag called name with a default value ("Guest") and a help message
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name := flag.String("name", "Guest", "specify your name")
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// Declare a flag called age with default value of 0 and a help message
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age := flag.Int("age", 0, "specify your age")
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// Bind the command-line flag with an existing variable
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var country string
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flag.StringVar(&country, "country", "", "enter your country")
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// Defining a custom flag
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var hobbiesFlag hobbies
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flag.Var(&hobbiesFlag, "hobbies", "comma separated list of hobbies")
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// Enable command-line parsing
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flag.Parse()
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fmt.Printf("Hello %s\n", *name)
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fmt.Printf("Your age is %d\n", *age)
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fmt.Printf("Your are from %s\n", country)
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fmt.Printf("Your hobbies are: ")
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for _, hobby := range hobbiesFlag {
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fmt.Printf("%s ", hobby)
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}
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fmt.Println()
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// Read all the positional arguments
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fmt.Println("Positional Arguments:", flag.Args())
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// Read the i'th positional argument
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i := 0
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fmt.Printf("Positional argument at index %d: %v\n", i, flag.Arg(i))
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}
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package main
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import (
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"flag"
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"fmt"
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)
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func main() {
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s := flag.Int("s", 0, "start line number")
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t := flag.Int("t", 0, "end line number")
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// Enable command-line parsing
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flag.Parse()
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fmt.Printf("Search file from line number %d to %d\n", *s, *t)
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// Read all the positional arguments
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fmt.Println("for keywords:", flag.Args())
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// Read the i'th positional argument
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i := 0
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fmt.Printf("The keyword at index %d: %v\n", i, flag.Arg(i))
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}
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package main
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import (
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"fmt"
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"net/url"
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)
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func main() {
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// QueryEscape: Escape a string to safely place it inside a URL query string
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str := "Gol@ng?&"
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encodedStr := url.QueryEscape(str)
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fmt.Println(encodedStr)
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// PathEscape: Escape a string to safely place it inside a URL path segment
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pathVar := "Gol@ng?&"
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encodedPathVar := url.PathEscape(pathVar)
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fmt.Println(encodedPathVar)
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}
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package main
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import (
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"fmt"
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"net/url"
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)
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func main() {
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// QueryUnescape: Decode a URL query string
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encodedStr := "Gol%40ng%3F%26"
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decodedStr, err := url.QueryUnescape(encodedStr)
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if err != nil {
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fmt.Printf("Error decoding the string %v", err)
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}
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fmt.Println(decodedStr)
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// PathUnescape: Decode a URL path segment
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encodedPathVar := "Gol@ng%3F&"
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decodedPathVar, err := url.PathUnescape(encodedPathVar)
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if err != nil {
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fmt.Printf("Error decoding the string %v", err)
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}
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fmt.Println(decodedPathVar)
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}
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package main
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import (
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"encoding/base64"
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"fmt"
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)
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func main() {
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data := "Gol@ng is Awesome?~"
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// Standard Base64 Encoding
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encodedData := base64.StdEncoding.EncodeToString([]byte(data))
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fmt.Println(encodedData)
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// Standard Base64 Encoding without padding
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encodedDataWithoutPadding := base64.RawStdEncoding.EncodeToString([]byte(data))
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fmt.Println(encodedDataWithoutPadding)
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// URL and filename-safe Base64 encoding
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urlSafeEncodedData := base64.URLEncoding.EncodeToString([]byte(data))
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fmt.Println(urlSafeEncodedData)
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// URL and filename-safe Base64 encoding without padding
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urlSafeEncodedDataWithoutPadding := base64.RawURLEncoding.EncodeToString([]byte(data))
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fmt.Println(urlSafeEncodedDataWithoutPadding)
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}

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