Run results for: array of objects to object

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser: Chrome 115

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
reduce with spread	1538155.1 Ops/sec
reduce with assign	8253065.0 Ops/sec
reduce with mapped assign	15577807.0 Ops/sec

HTML Preparation code:

<script>
const parts = [{
        "type": "currency",
        "value": "€"
    },
    {
        "type": "integer",
        "value": "1"
    },
    {
        "type": "group",
        "value": ","
    },
    {
        "type": "integer",
        "value": "000"
    },
    {
        "type": "decimal",
        "value": "."
    },
    {
        "type": "fraction",
        "value": "00"
    }
]
</script>

Tests:

reduce with spread
parts.reduce((result, { type, value }) => ({ ...result, [type]: value }), {});
reduce with assign
parts.reduce((result, { type, value }) => { result[type] = value; return result; }, {});
reduce with mapped assign
parts.reduce((result, { type, value }) => { switch (type) { case 'currency': result.currencySign = value; break; case 'decimal': result.decimalSeparator = value; break; case 'group': result.thousandSeparator = value; break; default: break; } return result; }, {});

Run results for: array of objects to object

reduce with spread

reduce with assign

reduce with mapped assign