I don’t see anything particularly special about a solution in the Go programming language. For example, // The Love-Letter Mystery // https://www.hackerrank.com/challenges/the-love-letter-mystery package main import ( “bufio” “fmt” “io” “os” “strconv” ) // palindrome returns the minimum number of operations carried out // to convert a word into a palindrome. // A word is a … Read more
Here’s one way to do it: fmt.Println(“Start of session”) defer fmt.Println(“Room Empty”) for i := 0; i < 6; i++ { s := Student{Name: “Student” + strconv.Itoa(i)} s.Present() defer s.Leave() } fmt.Println(“End of session”) playground example The deferred functions are executed on return from the function in reverse order. 5 solved Go: basic for loop … Read more
func LeadZeros(num string) int { i := 0 for ;i < len(num) && num[i] == ‘0’; i++ { } return i } There are a lot of ways to do this and I would suggest the easiest to understand. Here is another one-liner: func LeadZeros(num string) int { return len(num) – len(strings.TrimLeft(num, “0”)) } 1 … Read more
You can’t take the address of a function definition, you can take the address of a function value. This works: g := &f Playground example: https://play.golang.org/p/BokYCrVmV_p solved What are function pointers good for in Go if you can’t assign them values?
Use the “current state of art” regexp package. It has support for \w and \s and also handles non capturing groups (?:re). 2 solved Poor regular expressions in Go [closed]
The list inside the struct { … } is the list of field declarations. The Protocol field at the top is an embedded field declaration. The rest is declared using the <FieldName> <FieldType> format. For example closed <-chan struct{} is a field named closed whose type is <-chan struct{} (a receive-only channel whose element type … Read more
You’re taking *strings when you really only need strings. It’s a simple change to derefernce the pointers you get back from AWS SDK (it uses pointers for everything for nullability): var accountList []string for _, accountId := range result.Accounts { accountList = append(accountList, *accountId.Id) } fmt.Println(accountList) solved Is it possible to change the output to … Read more
Because you are filling x[i] with each of the values of scores. You have one extra loop. Since the last value of the slice scores is 83, you are filling x one more time, with 83 for each slot. Simpler would be: for i, _ := range x { // fill up x array with … Read more
I’m familiar with the syntax: variableName type in Go. Is this a channel type, or an int type, or a chan int type? And what’s with the weird syntax? chan int is the type. It’s just as “weird” as []int. solved Why syntax for channel parameters are different? Are there any underlying meaning?
Here you are. package main import ( “bytes” “encoding/json” “io” “log” “net/http” “os” “time” ) type Elememt struct { ID int `json:”id”` FirstName string `json:”first_name”` LastName string `json:”last_name”` Time time.Time `json:”time”` Count int `json:”count”` Payout string `json:”payout”` } func main() { elements := []Elememt { { ID: 1, FirstName: “Dmitriy”, LastName: “Groschovskiy”, Time: time.Now(), Count: … Read more
Answer 1, with no loops just recursion package main import ( “fmt” “os” “strconv” ) func factors(n int, t int, res *[]int) *[]int { if t != 0 { if (n/t)*t == n { temp := append(*res, t) res = &temp } res = factors(n, t-1, res) } return res } func cf(l1 []int, l2 … Read more
copy_numbers is of size 0, just as you initialized it. If I add the following before your first for loop: fmt.Println(numbers) fmt.Println(copy_numbers) I get: [5 2 3 5 3] [] the copy builtin copies up to the length of either argument, as mentioned in the docs: Copy returns the number of elements copied, which will … Read more
Since you have used sh -c, the next parameter should be the full command or commands: SystemdockerCommand := exec.Command(“sh”, “-c”, “docker exec 9aa1124 gluster peer detach 192.168.1.1 force”) More generally, as in here: cmd := exec.Command(“/bin/sh”, “-c”, “command1 param1; command2 param2; command3; …”) err := cmd.Run() See this example: sh := os.Getenv(“SHELL”) //fetch default shell … Read more
Looks like bigquery.NewClient returns a (*Client, error), so if you’re trying to encapsulate that, you can probably just write a function that returns a *bigquery.Client 3 solved How do you return a non primitive type variable in golang
{} is just an empty Json object, and it will decode fine to your Operandsstruct, as the struct is not required to have anything in the Operands array. You need to validate that yourself, e.g. err := json.NewDecoder(req.Body).Decode(&operands) if err != nil || len(operands.Values) == 0{ solved Golang not producing error when decoding “{}” body … Read more