Demo setting the useGrouping property
useGrouping will enable or disable the grouping separator (commonly known as the thousands separator)
by David Storey
JavaScript
console.log(new Intl.NumberFormat("ru", { useGrouping: true }).format(100000.10)); // 100 000,1
console.log(new Intl.NumberFormat("en", { useGrouping: false }).format(100000.10)); // 100000.10