Implementation of isPrime, Returns true if the number is prime, otherwise returns false. - Node.js Number

Node.js examples for Number:Algorithm

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Description

Implementation of isPrime, Returns true if the number is prime, otherwise returns false.

Demo Code


(function(window, undefined) {
  "use strict";//from  www.  j a  v a 2  s.c om
  // Check for an existing isPrime Number method
  if (!Number.prototype.isPrime) {
    Number.prototype.isPrime = function() {
      // Ensure the parameter is an integer
      var num = Math.round(this);
      for (var i = 2; i < this; i++) {
        if (this % i == 0) {
          return false;
        }
      }
      return true;
    }
  } else {
    console.log("The isPrime() already exists.");
  }
})(window);

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