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To check if an array in React is empty, access its length property, such as arr.length. If an array's length is equal to 0, then it is empty. If the array's length is greater than 0, then it is not empty....

To handle onKeyPress events in React: Set the `onKeyPress` attribute on the element. Use the key property of the event object to get the key the user pressed. For example, if(event.key === 'Enter') {}....

Break out of a map() loop in React: Call slice() method on an array to get a portion of the array. Call map() method on the portion of the array. Iterate over a portion of the array....

To check for null in React, use a comparison to check if a value is equal to or not equal to null, such as if (myValue === null) {} or if (myValue !== null) {}. If the condition is met, the if block will run....

To use an image as a link in React, wrap the image in an a tag, or in a `Link` tag if using React routing. An image will be rendered instead of a link, and clicking on the image will cause the browser to navigate to the specified page....

We can use the built-in children property to pass components as props in React. All the elements we pass between the opening and closing tags of the component are assigned to the children property....

To show an element on hover in React: Set `onMouseOver` and `onMouseOut` properties on the element. Track whether the user is hovering over the element in a state variable. Conditionally render other elements based on the state variable....

To open a link in a new tab in React, use an a element and set its `target` attribute to _blank, for example. A _blank value indicates that the resource is loaded into the new tab....

Generate a random number in React using the Math.random() function, for example, Math.floor(Math.random() * (max - min + 1)) + min. The Math.random function returns a number in the range of 0 to less than 1, but can also be used to generate numbers in...

To sort an array of objects in React: Create a shallow copy of the array. Call the array's `sort()` method, passing it a function. The function is used to define the sort order....

To set a data attribute for an element in React, set the attribute directly on the element, such as or use the setAttribute() method, such as el.setAttribute('data-foo', 'bar'). We can access the element on the event object or...

To handle double click events in React: Add an `onClick` attribute to the element. Use the detail property of the event object to get the number of clicks. If the number of clicks is equal to 2, handle the double click event....

The forEach() method can be used to iterate over an array outside of JSX code in React. If we need to iterate over an array and render its elements directly in JSX code, use the map() method instead....

To handle onKeyDown events in React: Set the onKeyDown prop on the element. Use the key property of the event object to get the key the user pressed. For example, if(event.key === 'Enter') {}....

Use css file to change the color of links in React. We can define the styles that apply to the anchor element and import the css file in the component to make the styles take effect....