Run results for: Map + filter + flat vs Reduce2223235ytt

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Safari/537.36

Browser: Chrome 116

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Test name	Executions per second
Map + filter + flat	9783943.0 Ops/sec
Reduce	8590825.0 Ops/sec

Script Preparation code:

var inputs = [{
        id: 1,
        type: 'product',
        quantity: 5
    },
    {
        id: 2,
        type: 'product',
        quantity: 2
    },
    {
        id: 3,
        type: 'bundle',
        quantity: 1,
        items: [{
                id: 4,
                type: 'product',
                quantity: 1
            },
            {
                id: 5,
                type: 'product',
                quantity: 1
            },
            {
                id: 6,
                type: 'product',
                quantity: 2
            },
            {
                id: 8,
                type: 'unknown',
                quantity: 2
            }
        ]
    },
    {
        id: 7,
        type: 'product',
        quantity: 1
    },
    {
        id: 8,
        type: 'unknown',
        quantity: 1
    }
]

function extractBundleItems(bundle) {
    return bundle.items.map(item => {
        return {
            item_id: item.id,
            item_type: item.type,
            quantity: item.quantity
        }
    })
}

Tests:

Map + filter + flat
inputs.map((item) => { if (item.type === 'product') { return { item_id: item.id, item_type: item.type, quantity: item.quantity, } } if (item.type === 'bundle') { return extractBundleItems(item) } return null })
Reduce
inputs.reduce((results, item) => { if (item.type === 'product') { results.push({ item_id: item.id, item_type: item.type, quantity: item.quantity, }) } if (item.type === 'bundle') { results.push(...extractBundleItems(item)) } return results }, [],)

Run results for: Map + filter + flat vs Reduce2223235ytt

Given an array input object

Map + filter + flat

Reduce