add underscore between words javascript

To add underscores between words in a JavaScript string, effectively replacing spaces with underscores, you can use the replace() or replaceAll() methods, or a combination of split() and join(). 1. Using replace() with a Regular Expression: This method uses a regular expression to find all occurrences of spaces and replaces them with an underscore. The /g flag ensures a global replacement (all occurrences, not just the first). […]

You can create user preferences in JavaScript by storing the choice when the user clicks something, and then reloading it whenever the page is opened again. The usual way is to use localStorage or cookies. Here’s a step-by-step example: Example: Save User Theme Preference (Dark/Light Mode) HTML JavaScript CSS How It Works

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