TypescriptTutor @TypescriptTutor

As of Typescript 3.7, you can use the “?.” syntax called “Optional Chaining” to safely navigate deep properties that might be undefined. typescriptlang.org/docs/handbook/…

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TypescriptTutor @TypescriptTutor

6 years ago

Use an abstract class to define methods to be implemented in classes that extend it. Typescript will throw compiler errors if they aren’t implemented correctly. typescriptlang.org/docs/handbook/…

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TypescriptTutor @TypescriptTutor

6 years ago

A nice little treat from Typescript 3.8, you can now export * as namespace! Check it out!

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TypescriptTutor @TypescriptTutor

6 years ago

Have a hard time remembering the difference between for..in and for..of loops? for *in* iterated *IN*dexes for *of* iterates *o*bjects (or the elements of the iterable)

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TypescriptTutor @TypescriptTutor

6 years ago

The “Parameters” built-in utility type returns a tuple type describing the arguments passed to a provided function signature. Any terms there you don’t understand? Just ask! There’s no such thing as a bad question. typescriptlang.org/docs/handbook/…

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TypescriptTutor @TypescriptTutor

6 years ago

The “NonNullable” built-in utility type removes the possibility of `undefined` or `null` from a type. typescriptlang.org/docs/handbook/…

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TypescriptTutor @TypescriptTutor

6 years ago

One more #TypescriptQuiz today! Which element does not belong in an array of the following type? Array<Record<string, string | number>>

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TypescriptTutor @TypescriptTutor

6 years ago

The “Extract” built-in utility type filters only the types from the first that are included in the second argument. typescriptlang.org/docs/handbook/…

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TypescriptTutor @TypescriptTutor

6 years ago

The “Exclude” built-in utility type removes all types from the first argument that match match the second argument. typescriptlang.org/docs/handbook/…

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TypescriptTutor @TypescriptTutor

6 years ago

The “Omit” built-in uitility type is used to keep all properties of a given type *except* for the ones passed in the second argument. typescriptlang.org/docs/handbook/…

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Tomasz Łakomy @tlakomy

6 years ago

If you're interested in TypeScript, go follow @TypescriptTutor immediately , they're just starting and I absolutely love the trend (?) of "Daily X tips"

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TypescriptTutor @TypescriptTutor

6 years ago

The “Pick” built-in utility type is used for selecting a subset of keys from another type. Every key you want must be listed as the second argument. typescriptlang.org/docs/handbook/…