Issue

In a go template I want to replace the the strings below with variables:

bot := DigitalAssistant{"bobisyouruncle", "teamAwesome", "awesomebotimagename", "0.1.0", 1, 8000, "health", "fakeperson@gmail.com"}

Say I want to replace bobisyouruncle with the variable input

How can I do this?

In js this is simply:

bot := DigitalAssistant{`${input}`, "teamAwesome", "awesomebotimagename", "0.1.0", 1, 8000, "health", "fakeperson@gmail.com"}

Solution

In Go, there is no such thing as string template literals such as on the es6. However, you can definitely do something similar by using fmt.Sprintf.

fmt.Sprintf("hello %s! happy coding.", input)

In your case it would be:

bot := DigitalAssistant{
    fmt.Sprintf("%s", input),
    "teamAwesome",
    "awesomebotimagename",
    "0.1.0",
    1,
    8000,
    "health",
    "fakeperson@gmail.com",
}

---

A curious question by the way. Why need to use string template literals on a very straightforward string like ${input}? why not just input?

---

EDIT 1

I cannot just put input because go gives the error cannot use input (type []byte) as type string in field value

[]byte is convertible into string. If your input type is []byte, simply write it as string(input).

bot := DigitalAssistant{
    string(input),
    "teamAwesome",
    "awesomebotimagename",
    "0.1.0",
    1,
    8000,
    "health",
    "fakeperson@gmail.com",
}

---

EDIT 2

why can’t I do the same if the value is an int? So for the values in the brackets 1 and 8000 I can’t just do int(numberinput) or int(portinput) or I’ll get the error cannot use numberinput (type []byte) as the type int in field value

Conversion from string to []byte or vice versa can be achieved by using the explicit conversion T(v). However, this method is not applicable across all types.

For example, to convert []byte into int more effort is required.

// convert `[]byte` into `string` using explicit conversion
valueInString := string(bytesData) 

// then use `strconv.Atoi()` to convert `string` into `int`
valueInInteger, _ := strconv.Atoi(valueInString) 

fmt.Println(valueInInteger)

I suggest taking a look at go spec: conversion.

Answered By – novalagung

Answer Checked By – Candace Johnson (GoLangFix Volunteer)