basicPromise.js

var promise = new Promise(function(resolve,reject){
    
    /* 
     * Do things here (synchronous or asynchronous)
     * some examples:
     * -- run loops
     * -- perform ajax requests
     * -- count sheep!
    */
    
    if(some_desired_condition) 
        resolve(some_desired_arg)
    else 
        reject(some_other_arg)
});

promise.then(function(some_desired_arg){
    /* 
     * handle desired output 
     * other examples online might call this "Success"
    */
}).catch(function(some_other_arg){
    /* 
     * handle other output 
     * other examples online might call this "Fail"
    */
});