Discover and read the best of Twitter Threads about #301DaysOfCode

The :is() CSS pseudo-class in one picture:👇👇

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Sorry for the typo in the pic above. Forgot to add comma after a element so it should be like this: 👇👇

header :is(h1, span, a, .btn)

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In #javascript array.some() determines whether the specified callback function returns true for any element of an array.

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A function that accepts up to three arguments. The some method calls the predicate function for each element in the array until the predicate returns a value which is coercible to the Boolean value true, or until the end of the array.

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@angular

In @angular 10 or above ng new --strict flag will setup your new project with following things:

✔️ Enables strict mode in TypeScript
✔️ Turns template type checking to Strict

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✔️ Default bundle budgets have been reduced by ~75%
✔️ Configures linting rules to prevent declarations of type any😍
✔️ Configures your app as side-effect free to enable more advanced tree-shaking

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Here are the mutable and immutable data types in #javascript

mutable:
🔹 Object
🔹 Array
🔹 Function

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immutable:
🔹 Boolean
🔹 Number
🔹 String
🔹 Symbol
🔹 Null
🔹 Undefined

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Dear #deverlopers or #codenewbies if you are confused about Promises and Observables then follow below thread.
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▶️ Observables vs Promises
Both Promises and Observablesprovide uswithabstractions that help usdeal with the asynchronousnatureof our applications. However, thereareimportantdifferences between thetwo:

1️⃣ As seen in theexample above, Observables candefineboth the setup and teardown aspects of asynchronousbehavior.

2️⃣ Observables are cancellable.

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@angular

@angular change detection is a transparent mechanism for synchronizing component data with the template view automatically (no application code needed).

There are two types of change detection.

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default change detection: Angular decides if the view needs to be updated by comparing all the template expression values before and after the occurrence of an event, for all components of the component tree.

OnPush change detection: this works by detecting if some new data has been explicitly pushed into the component, either via a component input or an Observable subscribed to using the async pipe.