Conclusion
This chapter covered the four different methods for delaying execution:
| Sleeping Sleeping is done when you must wait for something to occur before you can proceed. |
| Event Handlers Event handlers let you register one or more functions to be executed when an event occurs. |
| Callouts Callouts let you perform asyn chronous code execution. Callouts are used to execute your functions at a specific time. |
| Taskqueues Taskqueues also let you perform asynchronous code execution. Taskqueues are used for deferred work. |
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