从字符串价格中获取货币符号

Question

I have a prices:

var str1 = '10,00 €';
var str2 = '12.22 $';

I need get only currency symbol. I writed function:

 function stringToCurrency(str){
    return Number(str.replace("€", "").replace("$", "");
}

But this only replace currency symbol on '' . How I can get currency symbol?

Answer 1

If we use a regex to remove everything else (numbers, periods, commas, spaces) then we are only left with the currency symbols

 var str1 = '10,00 €'; var str2 = '12.22 $'; function getCurrencySymbol(str) { //replace all numbers, spaces, commas, and periods with an empty string //we should only be left with the currency symbols return str.replace(/[\\d\\., ]/g, ''); } console.log(getCurrencySymbol(str1)); console.log(getCurrencySymbol(str2)); 

Answer 2

Just pick the last char of the string

function stringToCurrency(str) {
    return str.trim().charAt(str.length - 1);
}

Answer 3

You can simply write a function that returns the last character of the string which represents the symbol that you want. Since Javascript string is a char array, you can access the last character by the length of the string as follows.

function stringToCurrency(str){
    return str[str.length-1];
}

Hope It will help you! Thanks

Answer 4

The way Number() works, is it returns an integer given any set of data. When you're passing these variables into it, like '10,00 €' , the Number function will return NaN because you're passing symbols and spaces into it.

To return only the symbol, JS has built-in methods that can be chained on to easily deal with this.

If the location is known, but value not, we can return the value of the given string location with charAt()

function knownLocation(s) {
  return s.charAt(s.length -1)
}

If the location of that symbol is unknown , but you know it's there, we can check which is there with .includes and then return the character at the index.

function knownValue(s) {
 if (s.includes("$")) {
    return s.charAt(s.indexOf("$"))
 } else if (s.includes("€")) {
   return s.charAt(s.indexOf("€"))
 } else {
   return undefined
 }
}