Category: JavaScript Answers

Sometimes, we want to use Node.js to open default browser and navigate to a specific URL.

In this article, we’ll look at how to use Node.js to open default browser and navigate to a specific URL.

How to use Node.js to open default browser and navigate to a specific URL?

To use Node.js to open default browser and navigate to a specific URL, we can use the open package.

To install it, we run

npm install open

Then we use it by writing

const open = require("open");

open("http://example.com");
open("http://example.com", { app: "firefox" });

to call open to open the URL we pass into it.

We can also call it with an object that has some options.

We set app to 'firefox' to open the URL in Firefox.

Conclusion

To use Node.js to open default browser and navigate to a specific URL, we can use the open package.

Sometimes, we want to represent a binary number in JavaScript.

in this article, we’ll look at how to represent a binary number in JavaScript.

How to represent a binary number in JavaScript?

To represent a binary number in JavaScript, we can use the 0b prefix in our number.

For instance, we write

const bin = 0b1111;

to assign bin to the binary number 1111.

Conclusion

To represent a binary number in JavaScript, we can use the 0b prefix in our number.

Sometimes, we want to run asynchronous process inside a JavaScript for loop.

In this article, we’ll look at how to run asynchronous process inside a JavaScript for loop.

How to run asynchronous process inside a JavaScript for loop?

To run asynchronous process inside a JavaScript for loop, we can use async an await.

For instance, we write

const func = async () => {
  let i;
  let j = 10;
  for (i = 0; i < j; i++) {
    await asycronouseProcess();
    console.log(i);
  }
};

to create the func function that runs a for loop.

In it, we call asycronouseProcess which is a function that returns a promise.

We use await to wait for the promise to finish before continuing to the rest of the code in the loop.

Conclusion

To run asynchronous process inside a JavaScript for loop, we can use async an await.

Sometimes, we want to remove event listener with JavaScript.

In this article, we’ll look at how to remove event listener with JavaScript.

How to remove event listener with JavaScript?

To remove event listener with JavaScript, we can use the removeListener method.

For instance, we write

let clickCount = 0;

const onClick = (event) => {
  clickCount++;
  if (clickCount == 50) {
    canvas.removeEventListener("click", onClick);
  }
};

canvas.addEventListener("click", onClick);

to call removeListener with 'click' and onClick to remove the click listener.

We add the click listener by calling addEventListener with 'click' and onClick.

Conclusion

To remove event listener with JavaScript, we can use the removeListener method.

Sometimes, we want to check whether a script is running under Node.js.

In this article, we’ll look at how to check whether a script is running under Node.js.

How to check whether a script is running under Node.js?

To check whether a script is running under Node.js, we can check if window is undefined.

For instance, we write

if (typeof window === "undefined") {
  exports.foo = {};
} else {
  window.foo = {};
}

to check if window is undefined with typeof window === "undefined".

If it’s undefined, then the script isn’t running in the browser.

Conclusion

To check whether a script is running under Node.js, we can check if window is undefined.