Export and import statements that we covered in previous chapters are called “static”.… First, we can’t dynamically generate any parameters of import.… That’s possible only because the structure of imports/exports is simple and fixed.… But how can we import a module dynamically, on-demand?… The import() expression.The import(module) expression loads the module and returns a promise that resolves
Import *.Usually, we put a list of what to import in curly braces import {...}, like this:… Import “as”.We can also use as to import under different names.… import {User} from ...
import User from ...… Import:
Importing named exports:
import {x [as y], ...} from "module"
Importing the default… export:
import x from "module"
import {default as x} from "module"
Import all
object, other importers will see that.… Further imports use the module.… It performs the import (fetches .… Analyze its dependencies: imports and then imports of imports etc.… Then we use import to directly import it where it’s needed.
What’s written is important.… But what’s not written may be even more important to understand what’s going on.… Comments that explain the solution are very important.… Summary.An important sign of a good developer is comments: their presence and even their absence.… Important solutions, especially when not immediately obvious.
important, for such properties, local styles take precedence.… important) can be overridden by the document.… important. Then local styles have precedence.
CSS custom properties pierce through shadow DOM.… Component author publishes these properties for developers, they are same important as other public component
That leads to two important issues:
Scripts can’t see DOM elements below them, so they can’t add handlers… That may be important for cases when we need to load a JavaScript library and then a script that depends… But it has important differences in the behavior.… Dynamic scripts.There’s one more important way of adding a script to the page.… practice, defer is used for scripts that need the whole DOM and/or their relative execution order is important
For instance, we have the logging function log(date, importance, message) that formats and outputs the… ’ve seen in the logging example, after currying the three argument universal function log(date, importance… gives us partials when called with one argument (like log(date)) or two arguments (like log(date, importance
Mouseout when leaving for a child.An important feature of mouseout – it triggers, when the pointer moves… Please note another important detail of event processing.… But there are two important differences:
Transitions inside the element, to/from descendants, are not… possible situations:
Once again, the important
Naturally, such a string should include all important properties.… Please note that a JSON-encoded object has several important differences from the object literal:
Strings… The important
An important feature of many browser objects (for instance) is that they can generate events.… The mixin will provide a method .trigger(name, [...data]) to “generate an event” when something important
That’s an important difference of inheritance between built-in objects compared to what we get with extends
That’s an important limitation: the result of obj1 + obj2 (or another math operation) can’t be another… Still, it’s important to know about all 3 hints, soon we’ll see why.… A conversion can return any primitive type.The important thing to know about all primitive-conversion
Still, there are important differences.… The important difference of class fields is that they are set on individual objects, not User.prototype
DOCTYPE is important
Please note: top-level geometry properties may work a little bit differently… Important:
To scroll the page with JavaScript, its DOM must be fully built.
Understanding how event loop works is important for optimizations, and sometimes for the right architecture… An important thing, right?… That’s important, as it guarantees that the application environment is basically the same (no mouse coordinate
Now here’s why it’s important.… Const objects can be modified
An important side effect of storing objects as references is
That’s important, because otherwise this inside it would reference the DOM element (elem), not the Menu… Not buttons, but the general approach is important here.
The moment of losing the focus (“blur”) can be even more important.… There are important peculiarities when working with focus events.
article we’ll learn more about different types of comparisons, how JavaScript makes them, including important… And, what’s more important, how to not fall into a trap with them.
The in-memory picture becomes:
This example demonstrates how important… And, what’s even more important, things change as engines develop, so studying deeper “in advance”, without
There are two important consequences:
We can use for..of to iterate over it:… Tables are a great example of that, and represent a particularly important case:
The <table> element
Before we get into JavaScript’s ways of dealing with styles and classes – here’s an important rule.… To see how to apply important and other rare stuff – there’s a list of methods at MDN.
That’s an important nuance. If there are no matches, we don’t get an empty array, but null.… The important
a minifier – a special program that shrinks code by removing extra comments, spaces and – what’s important
But probably the most important thing about "constructor" is that…
…JavaScript itself does
It’s not important. Many experienced developers live fine without knowing it.
That’s important, because after the response is consumed, we won’t be able to “re-read” it using response.json
That leads to important consequences for custom elements.… But such things can be important.
delays in synchronous calls, that are possible while reading from files, in Web Workers are less important
Not only that’s what we need, there’s an important performance gain when using flag y.
Name things right.Talking about variables, there’s one more extremely important thing.… Variable naming is one of the most important and complex skills in programming.
The important difference between them is that:
|| returns the first truthy value.
??
It’s only important that the end is after the start in the document.… Selection end/start vs Range
There’s an important difference between a selection anchor/focus… An important edge case is when selectionStart and selectionEnd equal each other.
Consuming functions can be registered (subscribed) using the methods .then and .catch.
then.The most important… There are important differences:
A finally handler has no arguments.
It’s not related to cross-origin things, but important to know.… Important when the data is sensitive.
On the other hand, it’s important to understand differences when migrating old scripts from var to let
select and option.A <select> element has 3 important properties:
select.options – the collection
Important… Please note that the comma operator has very low precedence, lower than =, so parentheses are important
Important:
Prototypes are global, so it’s easy to get a conflict.
Important:
Events onload/onerror track only the loading itself.
Please note that .call(this) is important here, because a simple this.… The difference may be non-essential for us, but it’s important for JavaScript.
The important point here is, that in the cleanup callback, it should be checked, if the entry was deleted… It is important to understand that during this time gap, the main program can make any changes to the… Of course, it is important to remember, that such behavior is not guaranteed, and depends on the specific
The importance of this feature becomes obvious if an operand isn’t just a value, but an expression with
Please note the important… That’s an interesting capability, but here another thing is important.… There are important nuances though.
But note the important detail: when the page is scrolled, the message flows away from the button.
But there are several important differences:
WebSocket
EventSource
Bi-directional: both client
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