Node Programming Examples

ES6 Collections Set values() and keys() Example2

node

'use strict' 
let set = new Set(); 
set.add('x'); 
set.add('y'); 
set.add('z'); 

for(let val of set){ 
   console.log(val); 
}

ES6 Collections Set values() and keys() Example1

node

var mySet = new Set(); 
mySet.add("Jim"); 
mySet.add("Jack"); 
mySet.add("Jane"); 
console.log("Printing keys()------------------");  

var keyitr = mySet.keys(); 
console.log(keyitr.next().value); 
console.log(keyitr.next().value); 
console.log(keyitr.next().value);  
console.log("Printing values()------------------"); 

var valitr = mySet.values(); 
console.log(valitr.next().value); 
console.log(valitr.next().value); 
console.log(valitr.next().value);

ES6 Collections Set Method has()

node

var mySet = new Set(); 
mySet.add("Jim");  
console.log(mySet.has("Jim"));   
console.log(mySet.has("Tom"));

ES6 Collections Set Method forEach

node

function userdetails(values) { 
   console.log(values); 
}  
var mySet = new Set(); 
mySet.add("John"); 
mySet.add("Jane"); 
mySet.forEach(userdetails);

ES6 Collections Set Method entries()

node

var mySet = new Set(); 
mySet.add("Jim"); 
mySet.add("Jack"); 
mySet.add("Jane"); 

var itr = mySet.entries() 
console.log(itr.next().value); 
console.log(itr.next().value); 
console.log(itr.next().value);

ES6 Collections Set Method delete()

node

var set = new Set(); 
set.add(10); 
set.add(20); 
set.add(30);
console.log(`Size of Set before delete() :${set.size}`); 
console.log(`Set has 10 before delete() :${set.has(10)}`); 

set.delete(10) 
console.log(`Size of Set after delete() :${set.size}`); 
console.log(`Set has 10 after delete() :${set.has(10)}`)

ES6 Collections Set Method clear()

node

var mySet = new Set('tom','jim','jack'); 
mySet.clear() 
var tot = mySet.size; 
console.log(tot);

ES6 Collections Set Method add()

node

var set = new Set(); 
set.add(10); 
set.add(10); // duplicate not added 
set.add(10); // duplicate not added 
set.add(20); 
set.add(30); 
console.log(set.size);

ES6 Collections Set Property Size

node

var mySet = new Set('tom','jim','jack'); 
var tot = mySet.size; 
console.log(tot);

ES6 Weak Maps

node

'use strict' 
let weakMap = new WeakMap(); 
let obj = {}; 
console.log(weakMap.set(obj,"hello"));  
console.log(weakMap.has(obj));// true

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