JSFiddle - React, Tailwind, and code Playground

JavaScript

a = "50.05 €"
b = "25.36 €"

function Numberize(num){
return +num.match(/[\d.]+/) 
} 

function ADDCurrencies(P1, P2){
return Numberize(P1) + Numberize(P2) + " €";
} 

alert( ADDCurrencies(a,b))