@kirz/expo-speedtest/build/utils.js

Measure internet latency, download and upload speed

export function percentile(vals, perc) {
    if (!vals.length)
        return 0;
    const sortedVals = vals.slice().sort(function (a, b) {
        return a - b;
    });
    const idx = (vals.length - 1) * perc;
    const rem = idx % 1;
    if (rem === 0)
        return sortedVals[Math.round(idx)];
    // calculate weighted average
    const edges = [Math.floor, Math.ceil].map(function (rndFn) {
        return sortedVals[rndFn(idx)];
    });
    return edges[0] + (edges[1] - edges[0]) * rem;
}
export function percentile90(arr) {
    return percentile(arr, 0.9);
}
export function calculateSpeedMbps(sizeInBytes, downloadTimeInMs) {
    const sizeInBits = sizeInBytes * 8;
    const downloadTimeInSeconds = downloadTimeInMs / 1000;
    const speedInBps = sizeInBits / downloadTimeInSeconds;
    const speedInMbps = speedInBps / 1e6; // 1 byte = 8 bits, 1 Mbps = 1e6 bits
    return speedInMbps;
}
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