@tommymynnson/lotide/middle.js

A mini clone of the [Lodash](https://lodash.com) library.

// Determines whether the array argument is of odd length or not.
const isOdd = (array) => {
  if (array.length % 2 !== 0) {
    return true;
  }

  return false;
};

// Returns the middle index of the array argument.
// Note: middle index of an even length array has right-side emphasis.
const getMiddleIndex = (array) => {
  return Math.floor(array.length / 2);
};

// Determines whether the array argument has a middle.
const isValid = (array) => {
  if (array.length < 3) {
    return false;
  }

  return true;
};

// Returns the element(s) as an array located in the middle of the array argument.
const middle = (array) => {
  if (!isValid(array)) {
    return [];
  }

  if (isOdd(array)) {
    const middle = [];

    middle.push(array[getMiddleIndex(array)]);

    return middle;
  }

  const middle = [];
  const middleIndex = getMiddleIndex(array);

  middle.push(array[middleIndex - 1], array[middleIndex]);

  return middle;
};

module.exports = middle;