Check if a string is a number in Go (Golang)

strconv.Atoi() function can be used to check if the string is a number. If this function returns an error if the passed string is not a number. This function parses the number to base 10

https://golang.org/pkg/strconv/#Atoi

Signature of the function is

func Atoi(s string) (int, error)

Working Code:

package main

import (
    "fmt"
    "strconv"
)
func main() {
    x := "1234"
    val, err := strconv.Atoi(x)
    if err != nil {
        fmt.Printf("Supplied value %s is not a number\n", x)
    } else {
        fmt.Printf("Supplied value %s is a number with value %d\n", x, val)
    }

    y := "123b"
    val, err = strconv.Atoi(y)
    if err != nil {
        fmt.Printf("Supplied value %s is not a number\n", y)
    } else {
        fmt.Printf("Supplied value %s is a number with value %d\n", y, val)
    }
}

Output:

Supplied value 1234 is a number with value 1234
Supplied value 123b is not a number