Nodejs Array None Predicate none(p)

Method Source Code

//same as:/*from  w  w  w  .  j  a  v a2 s.c  o  m*/
// Array.prototype.all = function (p) {
//   return this.filter(p).length == this.length;
// };

// [-1, 2, 3].none(isLessThanZero) => false
// [-1, -2, -3].none(isGreaterThanZero) => true
// *** YOUR CODE HERE ***

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) {
        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;
   };
   

5. none(p)

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