Run results for: Immer vs Spread Reduce4

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.145 Safari/537.36 Vivaldi/2.6.1566.49

Browser: Chrome 75

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
immer	3536.9 Ops/sec
Spread	2671.1 Ops/sec

HTML Preparation code:

<script src="https://cdn.jsdelivr.net/npm/immer@3.1.3/dist/immer.umd.min.js"></script>
<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

function getItems(count) {
  let id = 1;
  return _.times(count, () => ({
    name: "city" + id++,
    visited: true
  }))
}
data = getItems(100)

Tests:

immer
data.reduce((acc, curr) => { return immer.produce({}, draft => { draft[curr.name] = curr.visited; }); }, {});
Spread
data.reduce((acc, curr) => ({ ...acc, [curr.name]: curr.visited, }), {});