How to Replicate JavaScript\'s charCodeAt() Functionality in Go?

Obtaining the Numeric Unicode Value of Characters in Go

Q: Equivalence of JavaScript's charCodeAt() Method in Go

The charCodeAt() method in JavaScript is a powerful tool for obtaining the numeric Unicode value of a character at a given index. However, for developers transitioning to Go, finding an equivalent syntax can be a challenge.

A: Go's inbuilt Character Representation

In Go, the character type is represented by the rune type, which is an alias for int32. This means that characters in Go are already numeric values.

Getting the Char Code

To obtain the numeric Unicode value of a character in a string in Go, simply print it:

fmt.Println([]rune("s")[0]) // Prints 115

Alternatively, you can use Go's string range iterator to iterate over the runes of a string:

i := 0
for _, r := range "absdef" {
    if i == 2 {
        fmt.Println(r) // Prints 115
        break
    }
    i++
}

Go's Byte Representation

It's important to note that strings in Go are stored as byte arrays using UTF-8 encoding. If the string contains characters whose code is less than 127, you can work with bytes instead:

fmt.Println("s"[0]) // Prints 115

By leveraging rune's numeric representation and string iteration capabilities, you can easily replicate the functionality of JavaScript's charCodeAt() method in Go.

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