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Promise.mapSeries()
//Promises Series

/* Will execute each item in a iterable but will wait for successful execution of previous
item to finish.

*/




// Promise Map

Promise.map() 
/*Description: 
Runs all promises in an array in Parallel.

*/

Promise.each()

/*

Iteration happens serially and rejects if any promises are rejected in array. 

Returns promise or a thenable. 

Iterate over an array or a promise of an array, which contains promises ( or a mix of 
promises and values ) with the given iterator function with the signature (value, index, lengith)
where value is the resolved value. 

*/