How to Properly Declare and Use Variables Within Go\'s Conditional `if` Statements?

Variable Scope Within Conditional Statements in Go

When navigating the nuances of variable scopes in Go, particularly within conditional if statements, it can be perplexing to encounter the inability to define variables inside the statement while utilizing them subsequently.

Consider the following case:

if len(array1) > len(array2) {
    new1 := make([]string, 0, len(array1))
    // Use new1...
} else {
    new1 := make([]string, 0, len(array2))
    // Use new1...
}

This code raises an error because new1 cannot be declared within the if block. However, creating it before the block poses a problem as its size depends on the outcome of the comparison.

Solution

The optimal workaround is to declare new1 before the if block and utilize make within the statement:

var new1 []string

if len(array1) > len(array2) {
    new1 = make([]string, 0, len(array1))
    // Use new1...
} else {
    new1 = make([]string, 0, len(array2))
    // Use new1...
}

This allows for the creation of new1 with a size based on the conditional result, while maintaining its accessibility outside the if block.

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