Get all combinations in array with a given size

getArrayCombinations.js

const getArrCombos = (arr, comboSize) => {
  let combos = arr.reduce( (acc, v, i) => {
    if (comboSize === 1) {
      return acc.concat([[v]])
    } else {
      arrCombo = getArrCombos(arr.slice(i+1), comboSize - 1);
      return acc.concat(arrCombo.map( w => [v].concat(w)));
    }
  }, []);
  
  //Combos for $arr, with size of $comboSize
  return combos
}

console.log(getArrCombos([1,2,3,4], 2))
// expected output: [ [1,2], [1,3], [1,4], [2,3], [2,4], [3,4] ]

console.log(getArrCombos(['Rice', 'Beef', 'Fries', 'Coke'], 3))
/**
 * expected output:
 * [
 *  ["Rice", "Beef", "Fries"],
 *  ["Rice", "Beef", "Coke"],
 *  ["Rice", "Fries","Coke"],
 *  ["Beef", "Fries","Coke"]
 * ]
 */