Compact/Normalize data (omit null/empty values) for equality checks

compact-data-for-equality-check.js

const { isEmpty, isEqual } = require('lodash')

function deepPickBy(obj, predicate) {
  if (Array.isArray(obj)) {
    return obj.map((v) => deepPickBy(v, predicate));
  } else if (obj && typeof obj === 'object') {
    return Object.keys(obj).reduce((acc, key) => {
      const v = obj[key]
      if (v && typeof v === 'object' && Object.keys(v).length > 0) {
        acc[key] = deepPickBy(v, predicate);
      } else if (predicate(v)) {
        acc[key] = v;
      }
      return acc
    }, {});
  }
}

const data1 = {
  foo: 1,
  bar: null,
  baz: [],
  bla: {
    nested: false,
    nestedNull: null,
    nestedEmpty: {},
  }
}

const data2 = {
  foo: 1,
  bla: {
    nested: false,
  }
}

const normalize = (obj) => deepPickBy(obj, (v) => v != null && (typeof v !== 'object' || !isEmpty(v)))

console.log('isEqual(data1, data2)', isEqual(data1, data2))
console.log('data1', JSON.stringify(data1, null, 4))
console.log('data2', JSON.stringify(data2, null, 4))
console.log('normalize(data1)', JSON.stringify(normalize(data1), null, 4))
console.log('normalize(data2)', JSON.stringify(normalize(data2), null, 4))
console.log('isEqual(normalize(data1), normalize(data2))', isEqual(normalize(data1), normalize(data2)))