Use Case:

Sorting through nested arrays

First Principles:

• Arrays have a .sort() method (https://tc39.es/ecma262/#sec-array.prototype.sort) that can called on an array, and optionally can take a comparator, where the difference of two items’ values are compared
• Arrays have a .map() method for recomposing array values

Solutions

.map() and .sort() method

const largestOfArrays = (arr) => {
  const returnArr = arr.map((arr) => {
    arr.sort((a, b) => b - a);
    return arr[0];
  });

  return returnArr;
};

Why I had to learn this

Algorithm study