Category: JavaScript

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JavaScript Answers

How to fix the “Received: serializes to the same string” error with Jest and JavaScript?

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Sometimes, we want to fix the "Received: serializes to the same string" error with Jest and JavaScript.

In this article, we’ll look at how to fix the "Received: serializes to the same string" error with Jest and JavaScript.

How to fix the "Received: serializes to the same string" error with Jest and JavaScript?

To fix the "Received: serializes to the same string" error with Jest and JavaScript, we can use the toStrictEqual method.

For instance, we write

expect(array).toStrictEqual(["more than one", "more than one"]);

to check if array is exactly the same as ["more than one", "more than one"] by using a deep equality check.

Conclusion

To fix the "Received: serializes to the same string" error with Jest and JavaScript, we can use the toStrictEqual method.

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React Answers

How to use anchors with React Router?

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Sometimes, we want to use anchors with React Router.

In this article, we’ll look at how to use anchors with React Router.

How to use anchors with React Router?

To use anchors with React Router, we can use the react-router-hash-link package.

We install it by running

npm install --save react-router-hash-link

Then we use it by writing

import { HashLink as Link } from "react-router-hash-link";

<Link to="home-page#section-three">Section three</Link>;

to use the HashLink component with the to prop set to a URL with the anchor.

Conclusion

To use anchors with React Router, we can use the react-router-hash-link package.

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React Answers

How to share states between components using the useState hook in React?

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Sometimes, we want to share states between components using the useState hook in React.

In this article, we’ll look at how to share states between components using the useState hook in React.

How to share states between components using the useState hook in React?

To share states between components using the useState hook in React, we can lift the state up to the component that contains both components.

For instance, we write

const Ancestor = () => {
  const [count, setCount] = useState(1);

  return (
    <>
      <DescendantA count={count} onCountChange={setCount} />
      <DescendantB count={count} onCountChange={setCount} />
    </>
  );
};

to add the count state and set that as the value of the count prop of the DescendantA and DescendantB components.

Conclusion

To share states between components using the useState hook in React, we can lift the state up to the component that contains both components.

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JavaScript Answers

How to do string and number conversion with JavaScript?

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Sometimes, we want to do string and number conversion with JavaScript.

In this article, we’ll look at how to do string and number conversion with JavaScript.

How to do string and number conversion with JavaScript?

To do string and number conversion with JavaScript, we can use the parseInt function.

For instance, we write

const n = parseInt("123");

to parse string '123' into a number with parseInt.

Conclusion

To do string and number conversion with JavaScript, we can use the parseInt function.

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JavaScript Answers

How to create a set in JavaScript?

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Sometimes, we want to create a set in JavaScript.

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

How to create a set in JavaScript?

To create a set in JavaScript, we can use the Set constructor.

For instance, we write

const set = new Set();
set.add("red");
const hasRed = set.has("red");
set.delete("red");

to create a new set with the Set constructor.

Then we call add to add 'red' into the set.

Next we call has to check if 'red' is in the set.

And then we call delete to remove 'red' from the set.

Conclusion

To create a set in JavaScript, we can use the Set constructor.