Run results for: Merging array of objects [Lodash merge vs Array.prototype.reduce merge]

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:72.0) Gecko/20100101 Firefox/72.0

Browser: Firefox 72

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
lodash merge spread	278667.3 Ops/sec
lodash merge loop	40058.8 Ops/sec
reduce merge	2029149.6 Ops/sec

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

var x = null;
var testObjectArray = [{
    a: 1
}, {
    b: 1
}, {
    c: [1, 2, 3]
}, {
    d: "hello"
}, {
    e: "e",
    f: "f"
}];

var reduceMerge = (objectArray) => objectArray.reduce(((accumulator, object) => Object.assign(accumulator, object)))

Tests:

lodash merge spread
x = _.merge(...testObjectArray);
lodash merge loop
x = {} for(const object in testObjectArray) { x = _.merge(x, object); }
reduce merge
x = reduceMerge(testObjectArray);

Run results for: Merging array of objects [Lodash merge vs Array.prototype.reduce merge]

lodash merge spread

lodash merge loop

reduce merge