Pick random element(s) from an array by given number

array-random-pick.js

function randomPick(source = [], anyNumber = 1) {
  if (source.length > 0) {
    let result = [];
    
    // Duplicate original array
    let poppedArray = [].concat(source);
    let currentLength = poppedArray.length;

    for (let i = 0; i < anyNumber; i++) {
      // Generate random number to pick an element inside array
      const magicNumber = Math.floor(Math.random() * (currentLength - Math.random()));

      // Slice the array so picked element won't be picked anymore
      result.push(poppedArray.splice(magicNumber, 1)[0]);

      currentLength = poppedArray.length;
    }
  
    return result;
  }
  
  return source;
}