Nodejs Array All Predicate all(p)

Method Source Code

// Description:/*from   w w  w  . j  ava 2 s  . c om*/

// As a part of this Kata, you need to create three functions that one needs to be able to call upon an array:

// all

// This function returns true only if the predicate supplied returns true for all the items in the array

// [1, 2, 3].all(isGreaterThanZero) => true
// [-1, 0, 2].all(isGreaterThanZero) => false
// none

// This function returns true only if the predicate supplied returns false for all the items in the array

// [-1, 2, 3].none(isLessThanZero) => false
// [-1, -2, -3].none(isGreaterThanZero) => true
// any

// This function returns true if at least one of the items in the array returns true for the predicate supplied

// [-1, 2, 3].any(isGreaterThanZero) => true
// [-1, -2, -3].any(isGreaterThanZero) => false
// You do not need to worry about the data supplied, it will be an array at all times.

Array.prototype.all = function (p) {
  for (var i = 0; i <this.length; i++){
    if (p(this[i]) === false){
      return false;
    }
  }
  return true;
};

Related

1. all(p)

   Array.prototype.all = function (p) {
     for(var i = 0; i < this.length; i++){
       if(!p(this[i])) return false;
     return true;
   };
   

2. all(p)

   Array.prototype.all = function (p) {
    return this.filter(p).length == this.length;
   };
   

3. all(p)

   Array.prototype.all = function (p) {
     for (i = 0; i < this.length; i++)
       if (!p(this[i])) return false;
     return true;
   };
   

4. all(p)

   Array.prototype.all = function (p) {
     for(let el of this){
       if(!p(el)) {return false;}
     return true;
   };
   

5. all(p)

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

6. all(predicate)

   Array.prototype.all = function(predicate){
     for (var i = 0; i < this.length; i++){
       if (!predicate(this[i])) {
         return false
     return true
   

7. all(predicate, context)

   Array.prototype.all = function (predicate, context) {
     context = context || window;
     predicate = predicate || Predicate;
     var f = this.every || function (p, c) {
       return this.length == this.where(p, c).length;
     };
     return f.apply(this, [predicate, context]);
   };
   

8. allItemsAre(xAndY)

   Array.prototype.allItemsAre = function(xAndY){
      for(var i = 0; i < this.length; i++)
       if(!xAndY(this[i])){
         return false;
     return true;
   

9. allItemsAre(xAndY)

   Array.prototype.allItemsAre = function(xAndY){
        for(var i = 0; i < this.length; i++)
       if(!xAndY(this[i])){
         return false;
     return true;