Category: JavaScript Answers

Sometimes, we want to add global variables in JavaScript across multiple files.

In this article, we’ll look at how to add global variables in JavaScript across multiple files.

How to add global variables in JavaScript across multiple files?

To add global variables in JavaScript across multiple files, we can save our variable data in local storage.

To do this, we write

localStorage.setItem("data", 10);

to call localStorage.setItem with the key and value of the entry to save.

Then we can get the value saved with the key with

const number = localStorage.getItem("data");

We call getItem with the key of the entry to get to return the value.

Conclusion

To add global variables in JavaScript across multiple files, we can save our variable data in local storage.

Sometimes, we want to fix Home does not contain an export named Home error with JavaScript.

In this article, we’ll look at how to fix Home does not contain an export named Home error with JavaScript.

How to fix Home does not contain an export named Home error with JavaScript?

To fix Home does not contain an export named Home error with JavaScript, we should make sure that we import Home correctly.

For instance, if we have a default export

export default Home;

Then we import it by writing

import Home from './layouts/Home';

And if we have a named import like

export { Home };

Then we import it by writing

import { Home } from './layouts/Home';

Conclusion

To fix Home does not contain an export named Home error with JavaScript, we should make sure that we import Home correctly.

Sometimes, we want to concatenate properties from multiple JavaScript objects.

In this article, we’ll look at how to concatenate properties from multiple JavaScript objects.

How to concatenate properties from multiple JavaScript objects?

To concatenate properties from multiple JavaScript objects, we can use the object spread syntax.

For instance, we write

const obj1 = { 1: 11, 2: 22 };
const obj2 = { 3: 33, 4: 44 };
const obj3 = { ...obj1, ...obj2 };

to put the properties of obj1 and obj2 into a new object with the spread operator and assign the new object to obj3.

Conclusion

To concatenate properties from multiple JavaScript objects, we can use the object spread syntax.

Sometimes, we want to open a download window without navigating away from the page with JavaScript.

In this article, we’ll look at how to open a download window without navigating away from the page with JavaScript.

How to open a download window without navigating away from the page with JavaScript?

To open a download window without navigating away from the page with JavaScript, we create an anchor element and then click it.

For instance, we write

const filePath = "host/path/file.ext";
const a = document.createElement("a");
a.href = filePath;
a.download = filePath.substr(filePath.lastIndexOf("/") + 1);
document.body.appendChild(a);
a.click();
document.body.removeChild(a);

to call createElement to create an a element.

Then we set its href property to the URL of the file to download.

The download property is set to the file name of the downloaded file.

Then we call click to download the file.

Conclusion

To open a download window without navigating away from the page with JavaScript, we create an anchor element and then click it.

Sometimes, we want to loop through properties in a JavaScript object with Lodash.

In this article, we’ll look at how to loop through properties in a JavaScript object with Lodash.

How to loop through properties in a JavaScript object with Lodash?

To loop through properties in a JavaScript object with Lodash, we use the forOwn function.

For instance, we write

_.forOwn(obj, (value, key) => {});

to call forOwn with obj and a callback that has the value and key of each obj property as parameters.

forOwn only loops through non-inherited properties in obj.

Conclusion

To loop through properties in a JavaScript object with Lodash, we use the forOwn function.