Use callbacks to enforce the order of operations that we want.
users = ["Sam", "Alice", "Bob"]
def addUser(username):
users.push(username)
def getUsers():
print(users)
addUser("Jake")
# This might run because addUsers() could be faster (in another region)
getUsers()
Fix
We provide a function as an argument to another function.
users = ["Sam", "Alice", "Bob"]
def addUser(username, callback):
users.push(username)
callback() # Calling the function in here
def getUsers():
print(users)
addUser("Jake". getUsers) # Notice we are passing in getUsers, not getUsers() as we do not want the function to run until inside addUser()
# This might run because addUsers() could be faster (in another region)
getUsers()
