Using toLocaleString with Numbers, Arrays or Dates in JavaScript

dateObject.toLocaleString(locales, options)

const date = new Date();

console.log(date.toLocaleString(`en-US`)); 
// 11/10/2019, 4:32:44 PM

console.log(date.toLocaleString(`hi-IN`));
// 10/11/2019, 4:32:44 pm

console.log(date.toLocaleString(`fr-CH`));
// 10.11.2019 à 16:32:44

const options = {
  weekday: 'long',
  era: 'long'
}

console.log(date.toLocaleString(`en-US`, options)); 
// Sunday Anno Domini

console.log(date.toLocaleString(`hi-IN`, options));
// ईसवी सन रविवार

console.log(date.toLocaleString(`fr-CH`, options));
// après Jésus-Christ dimanche

number.toLocaleString(locales, options)

const number = 12345.678;

console.log(number.toLocaleString('en-US')); 
// 12,345.678

console.log(number.toLocaleString('fr-FR')); 
// 12 345,678

console.log(number.toLocaleString('en-US', {
  style: 'currency',
  currency: 'USD'   // With currency, the currency code is also required
}));  // $12,345.68

console.log(number.toLocaleString('hi-IN', {
  style: 'currency',
  currency: 'INR'
}));  // ₹12,345.68

console.log(number.toLocaleString('en-US', {
  style: 'currency',
  currency: 'USD',
  maximumSignificantDigits: 2
}));  // $12,000

array.toLocaleString(locales, options)

const arr = [12345678, new Date(), "alligators"];
console.log(arr.toLocaleString(`fr-FR`,{
  style: 'currency',
  currency: 'EUR',
  era: 'long'
}));

//  12 345 678,00 €,10 11 2019 après Jésus-Christ à 18:30:03,alligators

const arr2 = [12345678, new Date(), "alligators"];
console.log(arr.toLocaleString(`en-US`,{
  style: 'currency',
  currency: 'USD',
  era: 'long'
}));

//  $12,345,678.00,11 10, 2019 Anno Domini, 6:31:56 PM,alligators