Javascript Array filter(f)

Description

Javascript Array filter(f) 


const { books } = require('../books.js');

Array.prototype._filter = function(f){
 let result = [];
 this.forEach(item =>{//from   w  w  w  . ja  v  a 2 s  .c om
  if(f(item)){
   result.push(item)
  }
 });
 return result;
};

//const booksMaxPages = books._filter(book => book.pages > 400);
const funcBookMax = book => book.pages > 400;
const booksMaxPages = books._filter(funcBookMax);

console.log(booksMaxPages);

Javascript Array filter(f) 

// complete the following such that a new array with only integers
// (while numbers) is returned

var arr = ['hello', 42, true, function() {}, "123", 3.14, 0, [1], {}];

var isInteger = function(x) {
    return (typeof x === 'number' && isFinite(x) && Math.floor(x) === x);
}

Array.prototype.filter = function(f) {
    var newArr = [];
    for (var i = 0; i < this.length; i++) {
        if (f(this[i])) newArr.push(this[i]);
    }//from  ww  w  .  j  a  v a2 s.  c o  m
    return newArr;
};

var newArr = arr.filter(isInteger);
console.log(newArr);

Javascript Array filter(f) 

Array.prototype.filter = function(f) {
 var filtered = [];
  for(var i = 0; i < this.length; i++)
   f(this[i], i) && filtered.push(this[i]);
  return filtered;
};



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