JSFiddle - React, Tailwind, and code Playground

by alirokni

HTML

http://web2.0calc.es/preguntas/why-is-1-not-a-prime-number
<div id="test"></div>
<div id="test2"></div>
<div id="test3"></div>

JavaScript

Number.prototype.isPrime = function (number) {
    var no = this.valueOf(),
        result = false;
    result = (((no % 2 !== 0 && no % 3 !== 0) || (no == 2 || no == 3)) && no != 1) ? true : false;
    return result;
};

document.getElementById("test").innerHTML = (11).isPrime();
document.getElementById("test2").innerHTML = (21).isPrime();

var arr = [1,2,3,4];
var nArr = [10,20,30,40,50,60,70,80,90];
/*
var res = [];
  console.log(arr);
for (var i=arr.length-1; i>=0; i--){
  res.push(arr[i]);
}
  console.log(res);
*/
Array.prototype.myReverse = function(){
  var aArr = this; //this.valueOf();
  var res = [];
   for (var i=nArr.length-1; i>=0; i--){
    res.push(nArr[i]);
  }
  return res;
};
document.getElementById("test3").innerHTML =  nArr.myReverse();