Run results for: ramda vs lodash.merge vs deepmerge

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:109.0) Gecko/20100101 Firefox/111.0

Browser: Firefox 111

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
lodash	140558.2 Ops/sec
deepmerge	398085.7 Ops/sec
ramda	4582844.0 Ops/sec

HTML Preparation code:

<script src='https://raw.githubusercontent.com/lodash/lodash/4.17.19/npm-package/lodash.js'></script>
<script src='https://unpkg.com/deepmerge@4.2.2/dist/umd.js'></script>
<script src="//cdn.jsdelivr.net/npm/ramda@latest/dist/ramda.min.js"></script>

Script Preparation code:

var a = {
    a: 'oh',
    b: 'my',
    c: {
        a: 'a',
        b: {
            c: 'c'
        }
    }
};
var b = {
    c: {
        b: {
            d: 'a'
        },
        c: {
            d: 'd'
        }
    }
};
var x = {
    foo: {
        bar: 3
    },
    array: [{
        does: 'work',
        too: [1, 2, 3]
    }]
};
var y = {
    foo: {
        baz: 4
    },
    quux: 5,
    array: [{
        does: 'work',
        too: [4, 5, 6]
    }, {
        really: 'yes'
    }]
};

Tests:

lodash
var c = _.merge({}, a, b); var z = _.merge({}, x, y);
deepmerge
var c = deepmerge({}, a, b); var z = deepmerge({}, x, y);
ramda
var c = R.mergeAll({}, a, b); var z = R.mergeAll({}, x, y);