How to Reassign Values to Existing Variables in Go?

Reassigning Values to Existing Variables in Go

In Go, reassignment to an existing variable necessitates the removal of the colon (:) to avoid the "no new variables on left side of :=" error. This error occurs when a colon is used in a subsequent statement that assigns a new value to an already declared variable.

For example:

Consider the following code snippet:

package main

import "fmt"

func main() {
    myArray := [...]int{12, 14, 26}
    fmt.Println(myArray)

    myArray := [...]int{11, 12, 14} // Error: no new variables on left side of :=

    fmt.Println(myArray)
}

The first statement (myArray := [...]int{12, 14, 26}) declares myArray as an array of integers and assigns it the specified values. However, the subsequent statement, myArray := [...]int{11, 12, 14}, attempts to redeclare myArray and reassign it new values, which is not valid.

To rectify this issue, remove the colon (:) from the second statement:

myArray = [...]int{11, 12, 14}

Now, the code should run without encountering the "no new variables on left side of :=" error.

The colon (:) is used in the initial declaration of a variable using short variable declaration syntax. Once a variable has been declared, reassignment should be done without the colon.

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