Here are the 6 ways to trim a string in Golang. Using the “TrimSpace()” Function Using the “Trim()” Function Using the “TrimLeft()” Function Using the “TrimRight()” Function Using the “TrimSuffix()” Function Using the “TrimPrefix()” Function Method 1: Using the strings.TrimSpace() Function The easiest way to trim a string in Go is to use the “strings.TrimSpace()” … Read more
The Error: unexpected end of json input occurs when the “JSON being parsed is either empty or truncated.” To fix the Error: unexpected end of json input in Go, ensure the JSON input is complete and well-formed. package main import ( “encoding/json” “fmt” ) type Student struct { Name string `json:”name”` Age int `json:”age”` } … Read more
The omitempty in Go is a “JSON struct tag option that suggests the field should be omitted from the JSON output when encoding if it has an empty value (e.g., zero value for its type)”. This can help reduce the size of the resulting JSON and make it more readable by excluding unnecessary fields. Example package … Read more
The go:linkname must refer to declared function or variable error occurs in Golang when “using an older version of golang.org/x/sys package.” To fix the go:linkname must refer to declared function or variable error, you need to “update the golang.org/x/sys” package using this command: “go get -u golang.org/x/sys”. After upgrading to the Go 1.18 version, you might … Read more
To convert an interface{} to a string in Go, you can use the “fmt. Sprintf(v) function” or “.(string)” type assertion. Method 1: Using fmt.Sprintf(v) function In Go, you can convert an interface into a string “using the fmt.Sprintf(v) function.” Simply provide the value of your interface or its elements to this function to obtain its … Read more
Golang bytes.Count() function is used to “count the number of non-overlapping instances of the provided byte slice sep in the byte slice.” Syntax func Count(s, sep []byte) int Parameters s: It is the byte slice in which you want to search. sep: It is the byte slice you’re searching for. Return value The Count() function … Read more
To clear a map in Golang, you can either “reinitialize the map with make() function” or “for loop with delete() function.” Method 1: Reinitialize the map with make() Reinitializing the map with the make() function is more idiomatic and efficient in Go. If not referenced elsewhere, the old map will be collected by the garbage collector. … Read more
Golang io.Copy() function is “used to copy data from a source (reader) to a destination (writer) until either an error occurs or the end of the source is reached (EOF)”. Syntax func Copy(dst Writer, src Reader) (written int64, err error) Parameters dst: The destination io.Writer where the data will be written. src: The source io.Reader … Read more
The “mysql: Error 1040: Too many connections” error occurs in Golang when the “maximum number of concurrent connections to the MySQL server has been reached. By default, MySQL allows up to 151 concurrent connections.” In a Go application, this error might occur if your application creates many connections without closing them or uses a connection … Read more
To convert time.Time to a string in Go, use the “Time.String()” method, which outputs the time in a default format, or “Time.Format()” method if you need a custom format. Method 1: Using the time.String() function In Go, you can use the time.String() method that returns a string representation of the time.Time value in a default … Read more