Sampling data

sample-data.js

const samples = [];
sampleSize = 5;
records = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10];

records.forEach((record, index) => {
  if (samples.length < sampleSize) {
    samples.push(record);
  } else {
    let rand = Math.floor(Math.random() * index);
    if (rand < sampleSize) {
      samples[rand] = record;
    }
  }
});
console.log(samples);