Run results for: lodash merge vs deepmerge (updated FIXED)

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
lodash merge	541750.8 Ops/sec
deepmerge	280756.6 Ops/sec

HTML Preparation code:


<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.15/lodash.min.js'></script>
<script src='https://cdn.jsdelivr.net/npm/deepmerge@4.2.2/dist/cjs.min.js'></script>

Tests:

lodash merge
var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = _.merge(a, b);
deepmerge
const combineMerge = (target, source, options) => { const destination = target.slice() source.forEach((item, index) => { if (typeof destination[index] === 'undefined') { destination[index] = options.cloneUnlessOtherwiseSpecified(item, options) } else if (options.isMergeableObject(item)) { destination[index] = merge(target[index], item, options) } else if (target.indexOf(item) === -1) { destination.push(item) } }) return destination } var a = { a: 'oh', b: 'my', c: { a: 'a', b: { c: 'c' } } }; var b = { c: { b: { d: 'a' }, c: { d: 'd' } } }; var c = deepmerge(a, b, { arrayMerge: combineMerge });