iashris

import math
def atkin(nmax):
    """
    Returns a list of prime numbers below the number "nmax"
    """
    is_prime = dict([(i, False) for i in range(5, nmax+1)])
    for x in range(1, int(math.sqrt(nmax))+1):
        for y in range(1, int(math.sqrt(nmax))+1):
            n = 4*x**2 + y**2
            if (n <= nmax) and ((n % 12 == 1) or (n % 12 == 5)):

iashris

// set it up
firebase.storage().ref().constructor.prototype.putFiles = function(files) { 
  var ref = this;
  return Promise.all(files.map(function(file) {
    return ref.child(file.name).put(file);
  }));
}

// use it!
firebase.storage().ref().putFiles(files).then(function(metadatas) {