Lodash-mixin-diff-value NPM

lodash-mixin-diff-value

This is a lodash mixin for getting a JSON object that rappresent the value variation of a JSON respect another.

Installation

npm install lodash-mixin-diff-value

Usage

const _ = require('lodash');
const differenceValues = require('lodash-mixin-diff-value');

_.mixin({ differenceValues });

const diff = _.differenceValues(editedJson, originalJson[, options]);

options is a json with the fields:

Key	Values	Default	Description
extract	`[only-add, only-remove, only-changed, only-add-change]`	`only-add-change`	Described below
dateCheck	`true` or `false`	`true`	For performance: deactivate the date object and string evaluation
dateFormatIn	date-fns formats	`yyyy-MM-dd'T'HH:mm:ss.SSS'Z'`	The format to use to evaluate string during date checking
dateFormatOut	date-fns formats	`yyyy-MM-dd'T'HH:mm:ss.SSS'Z'`	The format to use to evaluate date-string comparison

Field: extract

only-add: will return only field that occurs in editedJson and not in originalJson
only-remove: will return only field that not occurs in editedJson and are in originalJson
only-changed: will return only field that occurs in editedJson and originalJson too
only-add-change: like only-add + only-changed

Field: dateCheck

If true: activate deep controls for the date object and strings. The input are evaluated with the options.dateFormatIn format and compared using the options.dateFormatOut format. This will enable you to read corectly a date in a format like options.dateFormatIn: yyyy-MM-dd but consider the date changed only if the year and month change options.dateFormatOut: yyyy-MM.

If false: only Date objects are evaluated as date.toISOString() for comparison.

Field: dateFormat

This format let you to execute the diff value on portion of the date string not only on the complete date. This cost in performance because all the string will be checked if match with this format.

Test

For run the tests simply execute:

npm test

Example

See test for more examples.

const oldObj = {
  a: 'b',
  arr: [1, 2, 3, { a: 111 }],
  more: 'more',
  intarr: [1, 2, 3, 4],
  newarr: [{ k: 'XXX' }, { k: 'val' }, 3333],
  arrtwo: [{ k: 'nod' }, { k: 'val' }],
  json: { a: 'a', b: 'b', c: 'c', d: { deep: [12, 3, { mode: 'deep' }] } },
  o: { sub: 'json' },
};

const newObj = {
  a: 'b',
  arr: [1, 22, 3, { a: 111, q: 'none' }],
  intarr: [1, 2, 3, 4],
  newarr: [{ k: 'XXX' }, { k: 'val' }, 3333],
  arrtwo: [{ k: 'XXX' }, { k: 'val' }, 3333],
  json: { a: 'a', b: 'b', c: 'c', d: { deep: [12, 333, { mode: 'deeper' }] } },
  o: { sub: 'json' },
};

const out = _.differenceValues(newObj, oldObj);

// Will print out:
{
  "arr": [
    22,
    {
      "q": "none"
    }
  ],
  "arrtwo": [
    {
      "k": "XXX"
    },
    3333
  ],
  "json": {
    "d": {
      "deep": [
        333,
        {
          "mode": "deeper"
        }
      ]
    }
  }
}