arrfn-anushka/index.js

A custom array utility package with useful HOFs

// 1st
function sum(arr) {
  return arr.reduce((total, num) => total + num, 0);
}
// 2nd
function average(arr) {
  return arr.length === 0 ? 0 : sum(arr) / arr.length;
}

// 3rd
function unique(arr) {
  return [...new Set(arr)];
}

// 4th
function max(arr) {
  return Math.max(...arr);
}
// 5th
function min(arr) {
  return Math.min(...arr);
}
// 6th
function countOccurrences(arr, value) {
  return arr.filter(item => item === value).length;
}
// 7th
function isSorted(arr) {
  for (let i = 1; i < arr.length; i++) {
    if (arr[i] < arr[i - 1]) return false;
  }

  return true;
}
// 8th
function removeValue(arr, value) {
  return arr.filter(item => item !== value);
}
// 9th
function countEvenOdd(arr) {
  let even = 0, odd = 0;
  arr.forEach(num => num % 2 === 0 ? even++ : odd++);
  return { even, odd };
}

// 10th
function reverseArray(arr) {
  return [...arr].reverse();
}

module.exports = {
    sum,
    average,
    unique,
    max,
    min,
    countOccurrences,
    isSorted,
    removeValue,
    countEvenOdd,
    reverseArray
};

// rray-helper-anushka
//  "description": "A custom array utility package with useful HOFs"
// ["array", "helper", "utilities", "HOF", "nodejs"]