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advanced js (Promised (how (using a promise (first() .then(second) …

- - - - first()
        .then(second)
        .then(function(data){
        console.log(data);
        })
        o/p is this is 1 output this is 2 output
        
        link to example.com
    - - var first = function(){
        return new Promise(function(resolve,reject){
        resolve("this is 1 output");
        });
        };
        var second = function(data){
        return new Promise(function(resolve,reject){
        resolve(data + "this is 2 output"
        });
        }
- - - - step 2
        
        children.prototype = Object.create(parent.prototype)
      - step 3
        
        children.prototype.constructor = parent.prototype
      - step 1
        
        parent.call(this);
- - - - onmessage = function(e){
        }
    - - eg: postmessage(obj);