Run results for: repository

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/53.0.2785.101 Safari/537.36

Browser: Chrome 53

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
using extra data constant	506654.8 Ops/sec
without extra constant	446609.3 Ops/sec

Script Preparation code:

const createItem = (value, index) => ({ id: index, label: "Label" });
const payload = new Array(3).map(createItem);
var action = { payload };

var emptyValues = (source) => {
    const copy = {};
    // create an object with the same properties but empty values
    Object.keys(source).forEach((key) => copy[key] = typeof source[key] === "string" ? "" : null);
    return copy;
};

var extractAttributes = (payload) => payload.attributes;

Tests:

using extra data constant
const repository = (payload) => { const data = payload.map(extractAttributes); return [ ...data.slice(0, 1).map(emptyValues), ...data ]; } repository(action.payload);
without extra constant
const repository2 = (payload) => { return [ ...payload.slice(0, 1).map(extractAttributes).map(emptyValues), ...payload.map(extractAttributes) ]; } repository2(action.payload);

Run results for: repository

using extra data constant

without extra constant