Category: JavaScript Answers

To use JavaScript scrollIntoView to do smooth scroll with offset, we can call scrollTo with an object that has the top and behavior properties.

For instance, we write

const element = document.getElementById("targetElement");
const headerOffset = 45;
const elementPosition = element.getBoundingClientRect().top;
const offsetPosition = elementPosition + window.pageYOffset - headerOffset;

window.scrollTo({
  top: offsetPosition,
  behavior: "smooth",
});

to call scrollTo with an object to set the top property to the top offset position.

And we set behavior to 'smooth' to do smooth scrolling.

We get offsetPosition by getting the computed top position of the element with getBoundingClientRect and add window.pageYOffset - headerOffset to it.

Conclusion

To use JavaScript scrollIntoView to do smooth scroll with offset, we can call scrollTo with an object that has the top and behavior properties.

Sometimes, we want to use JavaScript regex to split by line.

In this article, we’ll look at how to use JavaScript regex to split by line.

How to use JavaScript regex to split by line?

To use JavaScript regex to split by line, we can call the string split method with a regex.

For instance, we write

const result = subject.split(/\r?\n/);

to call subject.split with a regex that matches \r\n or \n and return an array with the substrings between the new line characters.

Conclusion

To use JavaScript regex to split by line, we can call the string split method with a regex.

Sometimes, we want to reverse an array in JavaScript without using libraries.

In this article, we’ll look at how to reverse an array in JavaScript without using libraries.

How to reverse an array in JavaScript without using libraries?

To reverse an array in JavaScript without using libraries, we use the array reverse method.

For instance, we write

const a = [3, 5, 7, 8];
const reversed = a.reverse();

to call a.reverse to return a new array with the elements in a reversed.

Conclusion

To reverse an array in JavaScript without using libraries, we use the array reverse method.

Sometimes, we want to call static method within a class with JavaScript.

In this article, we’ll look at how to call static method within a class with JavaScript.

How to call static method within a class with JavaScript?

To call static method within a class with JavaScript, we call the static method with the class.

For instance, we write

class MyClass {
  myNonStaticMethod() {
    console.log("I'm not static.");
    MyClass.myStaticMethod();
  }

  static myStaticMethod() {
    console.log("hey, I'm static!");
  }
}

to call myStaticMethod with MyClass.myStaticMethod() in the myNonStaticMethod method.

Conclusion

To call static method within a class with JavaScript, we call the static method with the class.

Sometimes, we want to detect time zone abbreviation using JavaScript.

In this article, we’ll look at how to detect time zone abbreviation using JavaScript.

How to detect time zone abbreviation using JavaScript?

To detect time zone abbreviation using JavaScript, we can use the toLocaleTimeString method.

For instance, we write

const [, , zone] = new Date()
  .toLocaleTimeString("en-us", { timeZoneName: "short" })
  .split(" ");
console.log(zone);

to create a Date object.

And then we call toLocaleTimeString to get a locale time string in the 'en-us' locale.

We set timeZoneName to 'short' to return a time string that includes the time zone abbreviation.

Then we call split to split the string by spaces and get the time zone abbreviation from the 3rd substring.

Conclusion

To detect time zone abbreviation using JavaScript, we can use the toLocaleTimeString method.