Run results for: Testing findMode

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.100 Safari/537.36

Browser: Chrome 61

Operating system: Windows

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
findMode	0.4 Ops/sec
mostCommonNumber	1.4 Ops/sec

Script Preparation code:

// Purposely global
numbers = Array.from({length: 1e6}, () => Math.floor(Math.random() * 1e20))

function findMode(numbers) {
    let counted = numbers.reduce((acc, curr) => { 
        if (curr in acc) {
            acc[curr]++;
        } else {
            acc[curr] = 1;
        }

        return acc;
    }, {});

    let mode = Object.keys(counted).reduce((a, b) => counted[a] > counted[b] ? a : b);

    return mode;
}

function mostCommonNumber(numbers) {
    let map = new Map()
    for (let num of numbers) {
        map.set(num, (map.get(num) || 0) + 1)
    }

    let mostCommonNumber = NaN
    let maxCount = -1
    for (let [num, count] of map.entries()) {
        if (count > maxCount) {
            maxCount = count
            mostCommonNumber = num
        }
    }

    return mostCommonNumber
}

Tests:

findMode
findMode(numbers)
mostCommonNumber
mostCommonNumber(numbers)