Bun wins

const runThatManyTimes = 100;
const fibSize = 10_000;
const fibRepeats = 1_000;
const executionTimes = new Array(runThatManyTimes);

function dev(arr) {
    // Creating the mean with Array.reduce
    let mean =
        arr.reduce((acc, curr) => {
            return acc + curr;
        }, 0) / arr.length;

    // Assigning (value - mean) ^ 2 to every array item
    arr = arr.map((k) => {
        return (k - mean) ** 2;
    });

    // Calculating the sum of updated array
    let sum = arr.reduce((acc, curr) => acc + curr, 0);

    // Calculating the variance
    let variance = sum / arr.length;

    // Returning the Standered deviation
    return Math.sqrt(sum / arr.length);
}

function runFib(runNumber) {
    const date = Date.now();

    for (let a = 0; a < fibRepeats; a++) {
        const fibonacci = new Array(fibSize);
        for (let i = 0; i < fibSize; i++) {
            fibonacci.push(fibonacci[i] + fibonacci[i + 1]);
        }
    }
    const executionTime = Date.now() - date;
    console.log(`Run number: ${runNumber}`);
    executionTimes[runNumber] = executionTime;
    console.log(`Execution time: ${executionTime}ms`);
}

for (let runNumber = 0; runNumber < runThatManyTimes; runNumber++) {
    runFib(runNumber);
}

const mediumRuntime =
    executionTimes.reduce((acc, v) => acc + v, 0) / executionTimes.length;

const standardDeviation = dev(executionTimes);
const min = Math.min(...executionTimes);
const max = Math.max(...executionTimes);

console.log(`Mean: ${mediumRuntime}ms`);
console.log(`Standard deviation: ${standardDeviation}ms
`);
console.log(`Max runtime: ${max}ms`);
console.log(`Min runtime: ${min}ms`);