number-format-init.js

const number = 123456.789;

console.log(new Intl.NumberFormat('th').format(number)); // expected output: 123,456.789
console.log(new Intl.NumberFormat('en-US', {style: 'unit', unit: 'liter'}).format(number)); // expected output: 123,456.789 L
console.log(new Intl.NumberFormat('en-GB', {style: 'unit', unit: 'liter'}).format(number)); // expected output: 123,456.789 l
console.log(new Intl.NumberFormat('en-US', {style: 'unit', unit: 'byte'}).format(number)); // expected output: 123,456.789 byte
console.log(new Intl.NumberFormat('en-US', { notation: "scientific" }).format(number)); // expected output: 1.235E5
console.log(new Intl.NumberFormat('en-US', { style: 'currency', currency: 'THB' }).format(number));// expected output: THB 123,456.79
console.log(new Intl.NumberFormat('th', { style: 'currency', currency: 'THB' }).format(number)); // expected output: ฿123,456.79
console.log(new Intl.NumberFormat('th-TH-u-nu-thai', { style: 'currency', currency: 'THB' }).format(number)); // expected output: ฿๑๒๓,๔๕๖.๗๙