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That is, functions which call external contracts should execute in the following order: | That is, functions which call external contracts should execute in the following order: | ||
'''Checks''' -First perform some checks (who called the function, are the arguments in range, did they send enough Ether, does the person have tokens, etc.). | '''1. Checks''' -First perform some checks (who called the function, are the arguments in range, did they send enough Ether, does the person have tokens, etc.). | ||
'''Effects''' -As the second step, if all checks passed, effects to the state variables of the current contract should be made. This updates the contract state | '''2. Effects''' -As the second step, if all checks passed, effects to the state variables of the current contract should be made. This updates the contract state | ||
'''Interaction''' - Interaction with other contracts should be the very last step in any function. | '''3. Interaction''' - Interaction with other contracts should be the very last step in any function. | ||
To illustrate the above consider a smart contract with only two (2) functions as follows: | To illustrate the above consider a smart contract with only two (2) functions as follows: | ||