Category: JavaScript

Sometimes, we want to create structs in JavaScript.

In this article, we’ll look at how to create structs in JavaScript.

How to create structs in JavaScript?

To create structs in JavaScript, we can create object literals.

For instance, we write

const obj = { id: 1, speaker: "john", country: "au" };

to create the obj object with various properties to store data like structs.

Conclusion

To create structs in JavaScript, we can create object literals.

Sometimes, we want to POST with multipart form data using fetch and JavaScript.

In this article, we’ll look at how to POST with multipart form data using fetch and JavaScript.

How to POST with multipart form data using fetch and JavaScript?

To POST with multipart form data using fetch and JavaScript, we can send a FormData object as its body.

For instance, we write

const sendData = async (url, data) => {
  const formData = new FormData();

  for (const [key, value] of Object.entries(data)) {
    formData.append(key, value);
  }

  const response = await fetch(url, {
    method: "POST",
    body: formData,
  });

  // ...
};

to create the senData function.

In it, we create a FormData object.

And then we use the for-of loop with Object.entries to loop through the keys and values of each property in data and add them to the formData object with append.

Then we call fetch to make a post request to the url with body set to formData.

Conclusion

To POST with multipart form data using fetch and JavaScript, we can send a FormData object as its body.

Sometimes, we want to fix JavaScript "Not a Constructor" Exception while creating objects.

In this article, we’ll look at how to fix JavaScript "Not a Constructor" Exception while creating objects.

How to fix JavaScript "Not a Constructor" Exception while creating objects?

To fix JavaScript "Not a Constructor" Exception while creating objects, we should create constructors with regular functions or the class syntax.

For instance, instead of writing

const F = () => {};
const f = new F();

We write

class F {}
const f = new F();

to replace the arrow function with class F.

class is syntactic sugar for constructor functions.

Conclusion

To fix JavaScript "Not a Constructor" Exception while creating objects, we should create constructors with regular functions or the class syntax.