Run results for: Deep merge lodash vs ramda vs deepmerge vs Immutable

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/18.5 Safari/605.1.15

Browser: Safari 18

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 10 months ago

Test name	Executions per second
Ramda.mergeDeepRight	2446494.2 Ops/sec
Lodash.merge	411156.4 Ops/sec
deepmerge	261771.0 Ops/sec
Immutable	413240.7 Ops/sec

HTML Preparation code:

<script src="//cdn.jsdelivr.net/npm/ramda@latest/dist/ramda.min.js"></script>
<script src="https://raw.githubusercontent.com/lodash/lodash/4.17.15-npm/lodash.js"></script>
<script src="https://unpkg.com/deepmerge/dist/umd.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/immutable/4.3.4/immutable.min.js'></script>

Script Preparation code:

var obj1 = {
  a: 10,
  b: {
    b1: 'Hello',
    b2: {
      b2a: [1, 2, 3],
      b2b: {
        b2b1: 'Deep',
        b2b2: [4, 5, 6],
        b2b3: {
          b2b3a: 11,
          b2b3b: 'Nested'
        }
      }
    }
  },
  c: [7, 8, 9],
  d: 'World'
};

var obj2 = {
  a: 15,
  b: {
    b1: 'Hola',
    b2: {
      b2a: [10, 11, 12],
      b2b: {
        b2b1: 'Profundo',
        b2b2: [13, 14, 15],
        b2b3: {
          b2b3a: 16,
          b2b3b: 'Anidado',
          b2b3c: 'Nuevo Campo'
        }
      }
    },
    b3: 'Nuevo Campo'
  },
  e: 'Mundo',
  f: {
    f1: [16, 17, 18],
    f2: {
      f2a: 'Adicional',
      f2b: {
        f2b1: 17,
        f2b2: 'Más Profundo'
      }
    }
  }
};

Tests:

Ramda.mergeDeepRight
R.mergeDeepRight(obj1, obj2)
Lodash.merge
_.merge(obj1, obj2)
deepmerge
deepmerge(obj1, obj2)
Immutable
var g = Immutable.mergeDeep(obj1, obj2);

Run results for: Deep merge lodash vs ramda vs deepmerge vs Immutable

Ramda.mergeDeepRight

Lodash.merge

deepmerge

Immutable