0_introducing_async_javascript
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Introducing Asynchronous Javascript
Node Tree
Nodes
| async_programming | |
| content | Asynchronous Programming: a technique that enables programs to start a potentially long-running task while still being responsive to other elements. |
| children | event_handlers |
| sync_programming | |
| content | Synchronous Programming |
| children | long_running_sync_fun_unresponsive |
| long_running_sync_fun_unresponsive | |
| content | Long-running synchronous functions will cause programs to be unresponsive |
| parents | sync_programming |
| event_handlers | |
| content | event handlers |
| children | event_handler_is_callback, form_async_programming |
| parents | callbacks, async_programming |
| form_async_programming | |
| content | form of asynchronous programming |
| parents | event_handlers |
| XMLHttpRequest | |
| content | XMLHttpRequest API: allows Http request to remote server. can attach event listeners to notify when done. |
| callbacks | |
| content | callbacks |
| children | cb_code_difficult_to_understand, event_handler_is_callback, event_handlers, func_passed_into_func (description), modern_apis_use_promises, callback_hell |
| event_handler_is_callback | |
| content | An event handler is a kind of callback |
| parents | callbacks, event_handlers |
| func_passed_into_func | |
| content | Function passed into another function, with the expectation that it will get called at the appropritae time |
| parents | callbacks |
| cb_code_difficult_to_understand | |
| content | callback-based code can get hard to understand when the callback itself has to call functions that accept a callback |
| children | common_if_op_breaks_into_async_funcs |
| parents | callbacks |
| callback_hell | |
| content | Callback Hell / pyramid of doom: deeply nested callbacks |
| children | modern_apis_use_promises (promises avoid callback hell) |
| parents | callbacks |
| common_if_op_breaks_into_async_funcs | |
| content | Common if you need to perform operation that breaks into series of asynchronous functions |
| parents | cb_code_difficult_to_understand |
| modern_apis_use_promises | |
| content | Modern asynchronous APIs used promises instead of callbacks |
| parents | callback_hell, callbacks |