Nodejs Array Square square()

Method Source Code

Array.prototype.square = function(){
    return this.map(function(e){
        return (e * e);
    });//from w  w  w.  j a  v  a2s.co  m
};

Array.prototype.cube = function(){
    return this.map(function(e){
        return (e * e * e);
    });
};

Array.prototype.sum = function(){
    return this.reduce(function(a,b){
        return a+b;
    });
};

Array.prototype.even = function(){
    var niz = [];

    this.forEach(function(a) {
        if (0 == a % 2) {
            niz.push(a);
        }
    });

    return niz;
};
Array.prototype.odd = function(){
    var niz = [];

    this.forEach(function(a) {
        if (0 != a % 2) {
            niz.push(a);
        }
    });

    return niz;
};


var niz1 = [1,3,4,5,6];
console.log(niz1.square());
console.log(niz1.cube());
console.log(niz1.sum());
console.log(niz1.even());
console.log(niz1.odd());

Related

1. square()

   Array.prototype.square = function(){
     return Array.from(this, x => x * x)
   

2. square()

   Array.prototype.square = function(){
       return this.map((element) =>  Math.pow(element,2));}
   ==
   Array.prototype.cube = function(){
       return this.map((element) =>  Math.pow(element,3));}
   

3. square()

   Array.prototype.square = function () {
     return this.map(function(n) { 
       return n * n; 
     });
   

4. square()

   Array.prototype.square = function () {
     return this.map(function (e) {
       return e * e;
     });
   };
   

5. square()

   Array.prototype.square = function () {
     return this.map((item) => {
       return Math.pow(item, 2);
     });
   };
   

6. square()

   Array.prototype.square = function (){
     var result = this.map(function(v){
         return v*v;
     });
     return result;
   };
   Array.prototype.cube = function (){
     var result = this.map(function(v){
       return v*v*v;
   ...
   

7. square()

   Array.prototype.square = function () { return this.map(elem => elem*elem); }
   Array.prototype.cube = function() { return this.map(elem => Math.pow(elem, 3)); }
   Array.prototype.average = function () { return this.length > 0 ? this.reduce((a,b) => a+b) / this.length : NaN;  }
   Array.prototype.sum = function () { return this.reduce((a,b) => a+b); }
   Array.prototype.even = function () { return this.filter(elem => elem % 2 === 0); }
   Array.prototype.odd = function () { return this.filter(elem => elem % 2 > 0); }
   

8. square()

   Array.prototype.square  = function () { return this.map(function(n) { return n*n; }); };
   Array.prototype.cube    = function () { return this.map(function(n) { return n*n*n; }); };
   Array.prototype.average = function () { return this.sum() / this.length; };
   Array.prototype.sum     = function () { return this.reduce(function(a, b) { return a + b; }, 0); };
   Array.prototype.even    = function () { return this.filter(function(item) { return 0 === item % 2; }); };
   Array.prototype.odd     = function () { return this.filter(function(item) { return 0 !== item % 2; }); };
   

9. square()

   Array.prototype.square = function()
     var ret = new Array();
     this.forEach(function(a) {
       ret.push(a * a);
     });
     return ret;