Node Programming Examples

ES6 instanceof Operator

node

'use strict' 
class Person{ } 
var obj = new Person() 
var isPerson = obj instanceof Person; 
console.log(" obj is an instance of Person " + isPerson);

ES6 Static Keyword

node

'use strict' 
class StaticMem { 
   static disp() { 
      console.log("Static Function called") 
   } 
} 
StaticMem.disp() //invoke the static metho

ES6 Classes Accessing Functions

node

'use strict' 
class Polygon { 
   constructor(height, width) { 
      this.h = height; 
      this.w = width;
   } 
   test() { 
      console.log("The height of the polygon: ", this.h) 
      console.log("The width of the polygon: ",this. w) 
   } 
} 

//creating an instance  
var polyObj = new Polygon(10,20); 
polyObj.test();

ES6 Map and Iterator Example3

node

var map = new Map([[1,'one'],[2,'two'],[3,'three']]); 
var iterator = map.keys(); 
console.log(iterator.next());

ES6 Colletions Map and Iterator Example2

node

var map = new Map([[1,'one'],[2,'two'],[3,'three']]); 
var iterator = map.values(); 
console.log(iterator.next());

ES6 Colletions Map and Iterator Example1

node

var map = new Map([[1,'one'],[2,'two'],[3,'three']]); 
var iterator = map.entries(); 
console.log(iterator.next());

ES6 Set and Iterator Example3

node

var  set = new Set(['a','b','c','d','e']);  
var iterator = set.keys(); 
console.log(iterator.next());

ES6 Set and Iterator Example2

node

var  set = new Set(['a','b','c','d','e']);  
var iterator = set.values(); 
console.log(iterator.next());

ES6 Set and Iterator Example1

node

var  set = new Set(['a','b','c','d','e']);  
var iterator = set.entries(); 
console.log(iterator.next())

ES6 Weak Set

node

'use strict' 
   let weakSet = new WeakSet();  
   let obj = {msg:"hello"}; 
   weakSet.add(obj); 
   console.log(weakSet.has(obj)); 
   weakSet.delete(obj); 
   console.log(weakSet.has(obj));

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