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const person = {
  name: 'Sam',
  age: 300,
}

const twinPerson = {
  ...person
}

#arguments #spread

airbnb/javascript: JavaScript Style Guide

// bad
function concatenateAll() {
  const args = Array.prototype.slice.call(arguments);
  return args.join('');
}

// good
function concatenateAll(...args) {
  return args.join('');
}

Deep copy object using spread operator

airbnb/javascript: JavaScript Style Guide

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