JSFiddle - React, Tailwind, and code Playground

JavaScript

var lang = 
{
    fr:
    {
        welcome     : 'bonjour',
        good_bye    : 'à bientôt'
    },
    en:
    {
        welcome     : 'welcome',
        good_bye    : 'good bye'
    },
    es:
    {
        welcome     : 'holà',
        good_bye    : 'adios'
    }
}

    function doWelcome(country, name) {
       return lang[country].welcome + ', ' + name + '. Good game.';
    }
    
    console.log(doWelcome('es', 'Jonas'));