shallow-compare.js

import typeOf from './type-of';

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

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

  return source === target;
};

This logic doesn't look correct

shallowCompare([1], [2])

will return true...