Run results for: test task

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/107.0.0.0 Safari/537.36 OPR/93.0.0.0

Browser: Opera 93

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
1reduce1foreach	57790.7 Ops/sec
Arrays	194738.4 Ops/sec
2reduce	16489.6 Ops/sec

Script Preparation code:

window.content = [{
        "date": "2017-07-31",
        "amount": "5422"
    },
    {
        "date": "2017-06-30",
        "amount": "5220"
    },
    {
        "date": "2017-05-31",
        "amount": "5365"
    },
    {
        "date": "2017-08-31",
        "amount": "5451"
    },
    {
        "date": "2017-09-30",
        "amount": "5303"
    },
    {
        "date": "2018-03-31",
        "amount": "5654"
    },
    {
        "date": "2017-10-31",
        "amount": "5509"
    },
    {
        "date": "2017-12-31",
        "amount": "5567"
    },
    {
        "date": "2018-01-31",
        "amount": "5597"
    },
    {
        "date": "2017-11-30",
        "amount": "5359"
    },
    {
        "date": "2018-02-28",
        "amount": "5082"
    },
    {
        "date": "2018-04-14",
        "amount": "2567"
    }
];

Tests:

1reduce1foreach
function sortOperations(operations) { const withoutSorting = operations.reduce((acc, {date}) => { const [year, month, day] = date.split('-') const monthDay=`${month}-${day}` return { ...acc, [year]: Array.isArray(acc[year]) ? [...acc[year], monthDay] : [monthDay]} }, {}) Object.entries(withoutSorting).forEach(([key, values])=>{withoutSorting[key] = values.sort()}) return withoutSorting } sortOperations(window.content)
Arrays
function sortOperations(operations){ let splittedDates = operations.map((e)=>e.date.split("-")) let years = Array.from(new Set(splittedDates.map((e)=>e[0]))) let output={} years.forEach((e)=>{ output[e] = splittedDates.filter(e1=>e1[0]===e).map(e1=>[e1[1],e1[2]].join("-")).sort() }) return output } sortOperations(window.content)
2reduce
function sortOperations(operations) { const withoutSorting = operations.reduce((acc, {date}) => { const [year, month, day] = date.split('-') const monthDay=`${month}-${day}` return { ...acc, [year]: Array.isArray(acc[year]) ? [...acc[year], monthDay] : [monthDay]} }, {}) return Object.entries(withoutSorting).reduce((acc, [key, values])=> ({ ...acc, [key]: values.sort((a,b) => +a.replace(/-/g, '') - +b.replace(/-/g, '')) }), {}) } sortOperations(window.content)

1reduce1foreach

Arrays

2reduce