removeSymbol.js

function removeSymbol(number){
    // make sure we are getting a string
     if (typeof number !== "string") throw new TypeError("Expected string");
    // check if the number has the + sign and remove it
    if(number.includes("+")){
        return number.replace(/\+/gi, "")
    }
    return number
}

// using flat arrows 
const removeSymbol = number => (number.includes("+") ? number.replace(/\+/gi, "") : number);

// usage for the above
removeSymbol("+260972342432") // would give us this "260972342432"