deep-comparison.js

const deepCompare = (source, target) => {
  if (typeOf(source) !== typeOf(target)) {
    return false;
  }

  if (typeOf(source) === 'array') {
    if (source.length !== target.length) {
      return false;
    }
    
    return source.every((entry, index) => deepCompare(entry, target[index]))
  } else if (typeOf(source) === 'object') {
    if (Object.keys(source).length !== Object.keys(target).length) {
      return false;
    }
    
    return Object.keys(source).every((key) => deepCompare(source[key], target[key]));
  } else if (typeOf(source) === 'date') {
    return source.getTime() === target.getTime();
  }

  return source === target;
};