Nodejs Array None Predicate none(p)

Method Source Code

// [-1, 2, 3].none(isLessThanZero) => false
// [-1, -2, -3].none(isGreaterThanZero) => true
Array.prototype.none = function (p) {
  var count = 0//from   w w  w . jav  a2  s.c  o  m
  for (var i = 0 ; i < this.length ; i++) {
    currentIndex = this[i]
    if (p(currentIndex) !== true) {
      count +=1 
    };
  }
  if (count !== this.length) {
    return false
  }
  return true
};

// OR

Array.prototype.none = function (p) {
  return this.filter(p).length == 0;
};

Related

1. none(p)

   Array.prototype.none = function(p) {
       var count = 0
       for (var i = 0; i < this.length; i++) {
           currentIndex = this[i]
           if (p(currentIndex) !== true) {
               count += 1
           };
       if (count !== this.length) {
   ...
   

2. none(p)

   Array.prototype.none = function (p) {
   if(this.length == 0){
       return true;
       for(var i=0;i<this.length;i++){
         if(p(this[i]) === true){
           break;
         else
   ...
   

3. none(p)

   Array.prototype.none = function (p) {
     for(var i = 0; i < this.length; i++){
       if(p(this[i])) return false;
     return true;
   };
   

4. none(p)

   Array.prototype.none = function (p) {
    return this.filter(p).length == 0;
   };