Callback Hell
2021-9-12 Less than 1 minute
# Callback Hell
# What are some of the signs and causes of Callback Hell?
Pyramid shapes, }) symbols, and making a top to bottom layout in one document instead of spreading it out. Other languages won't necessarily show the issue but Javascript does.
# What does the asynchronous mean and how are callbacks involved?
Lets simplify it. Asynchronous means takes some time. Callbacks are a convention. Callbacks happen when downloading things, reading files, talking to databases, etc. An example would look something like this:
var photo = downloadPhoto('https://www.cookingclassy.com/wp-content/uploads/2014/10/vegetable-soup-7.jpg')
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Nothing will happen right away as it is async.
# Summarize the 3 ways to avoid / fix Callback Hell
- Keep your code shallow
- Modularize
- Handle every single errors you may receive.