Category: JavaScript Answers

Sometimes, we want to dynamically creating variables in for loops with JavaScript.

In this article, we’ll look at how to dynamically creating variables in for loops with JavaScript.

How to dynamically creating variables in for loops with JavaScript?

To dynamically creating variables in for loops with JavaScript, we use an array.

For instance, we write

const createVariables = () => {
  const accounts = [];
  for (let i = 0; i <= 20; ++i) {
    accounts[i] = "whatever";
  }
  return accounts;
};

to define the createVariables function.

In it, we loop from i between 0 to 20.

And we use i as the index of the entry we want to put into accounts.

Conclusion

To dynamically creating variables in for loops with JavaScript, we use an array.

Sometimes, we want to use Promise.all with Axios and JavaScript.

In this article, we’ll look at how to use Promise.all with Axios and JavaScript.

How to use Promise.all with Axios and JavaScript?

To use Promise.all with Axios and JavaScript, we call Promise.all with an array of promises returned by Axios.

For instance, we write

const URL1 = "https://www.something.com";
const URL2 = "https://www.something1.com";
const URL3 = "https://www.something2.com";

const promise1 = axios.get(URL1);
const promise2 = axios.get(URL2);
const promise3 = axios.get(URL3);

const values = await Promise.all([promise1, promise2, promise3]);

to call Promise.all with an array with promises returned by axios.get.

Then we get the resolve value of each promise in the values array in the order they’re listed in the array that we called Promise.all with.

Conclusion

To use Promise.all with Axios and JavaScript, we call Promise.all with an array of promises returned by Axios.

Sometimes, we want to set a file name using window.open with JavaScript.

In this article, we’ll look at how to set a file name using window.open with JavaScript.

How to set a file name using window.open with JavaScript?

To set a file name using window.open with JavaScript, we use the download attribute on the link.

For instance, we write

<a href="foo.txt" download="your-foo.txt">Download Your Foo</a>

to set the download attribute to the name of the file we want to download.

The href attribute to the URL of the file.

Conclusion

To set a file name using window.open with JavaScript, we use the download attribute on the link.

Sometimes, we want to assign only if condition is true in ternary operator in JavaScript.

In this article, we’ll look at how to assign only if condition is true in ternary operator in JavaScript.

How to assign only if condition is true in ternary operator in JavaScript?

To assign only if condition is true in ternary operator in JavaScript, we use an if statement.

For instance, we write

if (max < b) {
  max = b;
}

to check if max is less than b.

If it is, then we assign b to max.

Conclusion

To assign only if condition is true in ternary operator in JavaScript, we use an if statement.

Sometimes, we want to parse a "dd/mm/yyyy" or "dd-mm-yyyy" or "dd-mmm-yyyy" formatted date string using JavaScript.

In this article, we’ll look at how to parse a "dd/mm/yyyy" or "dd-mm-yyyy" or "dd-mmm-yyyy" formatted date string using JavaScript.

How to parse a "dd/mm/yyyy" or "dd-mm-yyyy" or "dd-mmm-yyyy" formatted date string using JavaScript?

To parse a "dd/mm/yyyy" or "dd-mm-yyyy" or "dd-mmm-yyyy" formatted date string using JavaScript, we use moment.js.

For instance, we write

const day = moment("12-25-1995", "MM-DD-YYYY");

to call moment with the date string we want to parse and a string with the format of the date string being parsed.

MM stands for the 2 digit month.

DD stands for the 2 digit day.

And YYYY stands for the 4 digit year.

Conclusion

To parse a "dd/mm/yyyy" or "dd-mm-yyyy" or "dd-mmm-yyyy" formatted date string using JavaScript, we use moment.js.