Some useful javascript helper functions.

js-helpers.js

export const kebabToPascalCase = str.replace(/(?:^\w|[A-Z]|\b\w)/g, (letter, index) => letter.toUpperCase()).replace(/[^\w]+/g, "");
// eg: some-string => SomeString

export const toNepaliNumber = n => (n + '').replace(/\d/g, i => '०१२३४५६७८९'[i])

export const numberToWord = amount => {
  const a = ["", "One ", "Two ", "Three ", "Four ", "Five ", "Six ", "Seven ", "Eight ", "Nine ", "Ten ", "Eleven ", "Twelve ", "Thirteen ", "Fourteen ", "Fifteen ", "Sixteen ", "Seventeen ", "Eighteen ", "Nineteen"];
  const b = ["", "Ten", "Twenty", "Thirty", "Forty", "Fifty", "Sixty", "Seventy", "Eighty", "Ninety"];
  
  amount = (amount.toFixed(2)).toString().split(".");
  let number = amount[0].split(",").join("");
  let precision = amount.length > 1 ? amount[1].split(",").join("") : "00";
  
  if ((number = number.toString()).length > 9) return "overflow";
  let n = ("000000000" + number).substr(-9).match(/^(\d{2})(\d{2})(\d{2})(\d{1})(\d{2})$/);
  let p = ("00" + precision).substr(-2).match(/^(\d{2})$/);

  if (!n) {
    return;
  }

  let word = "";
  word += (Number(n[1]) !== 0) ? (a[Number(n[1])] || b[n[1][0]] + " " + a[n[1][1]]) + "Crore " : "";
  word += (Number(n[2]) !== 0) ? (a[Number(n[2])] || b[n[2][0]] + " " + a[n[2][1]]) + "Lakh " : "";
  word += (Number(n[3]) !== 0) ? (a[Number(n[3])] || b[n[3][0]] + " " + a[n[3][1]]) + "Thousand " : "";
  word += (Number(n[4]) !== 0) ? (a[Number(n[4])] || b[n[4][0]] + " " + a[n[4][1]]) + "Hundred " : "";
  word += (Number(n[5]) !== 0) ? ((word !== "") ? "and " : "") + (a[Number(n[5])] || b[n[5][0]] + " " + a[n[5][1]]) + "Ruppees, " : "";

  word += (Number(p[1]) !== 0) ? (a[Number(p[1])] || b[p[1][0]] + " " + a[p[1][1]]) + "Paisa only " : "";

  return word;
};

export const Cookies = function () {
    return {
        set: (key, value, exp) => {
            const date = new Date();
            date.setTime(date.getTime() + (exp * 24 * 60 * 60 * 1000));
            const expires = "expires=" + date.toUTCString();
            document.cookie = key + "=" + value + ";" + expires + ";path=/";
        },

        get: (key) => {
            const name = key + "=";
            const decodedCookie = decodeURIComponent(document.cookie);
            const ca = decodedCookie.split(';');
            for (let i = 0; i < ca.length; i++) {
                let c = ca[i];
                while (c.charAt(0) === ' ') {
                    c = c.substring(1);
                }
                if (c.indexOf(name) === 0) {
                    return c.substring(name.length, c.length);
                }
            }
            return "";
        }
    }
}();

const getViewPort = () => {
      let e = window,
          a = 'inner';
      if (!('innerWidth' in window)) {
          a = 'client';
          e = document.documentElement || document.body;
      }

      return {
          width: e[a + 'Width'],
          height: e[a + 'Height']
      };
  }

export const encode = str => encodeURIComponent(btoa(str))

export const decode = str => atob(decodeURIComponent(str))