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TCZ
TCZ

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callback hells

I'm happy that I finally learned how promise, async, await, try and catch work together! Now I can remove many callback hells that exist in my node.js project. I did not know that they were called "callback hells" when I created them. But I did find it frustrating to write deeply nested code. With the promise-async-await-try-catch sword, I feel that I can conquer the hells now.

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typescript

11 Tips That Make You a Better Typescript Programmer

1 Think in {Set}

Type is an everyday concept to programmers, but it’s surprisingly difficult to define it succinctly. I find it helpful to use Set as a conceptual model instead.

#2 Understand declared type and narrowed type

One extremely powerful typescript feature is automatic type narrowing based on control flow. This means a variable has two types associated with it at any specific point of code location: a declaration type and a narrowed type.

#3 Use discriminated union instead of optional fields

...

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