To export multiple functions in JavaScript, use the export statement and export the functions as an object. For example: Alternatively, you can use the export statement in front of the function definitions. This exports the function in question automatically and you do not need to use the export statement separately. For instance: This is the […]
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Commonly you see the Uncaught TypeError: cannot set property innerText of null error if you try to access an HTML element on a page before it appears. The solution. Move your JavaScript from the head to the body tag below the HTML element you are trying to access. An Example Situation Let’s say you are
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To ask for user input in JavaScript, use the built-in window.prompt() method. For example: This shows the following modal at the top of your page: Prompt Box in JavaScript To ask for user input in JavaScript, you can use the built-in prompt box. To show a prompt, use the prompt() method. This method takes two
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The difference between undefined and undeclared variables in JavaScript is: This is a comprehensive guide to understanding the differences between undefined and undeclared in JavaScript. Examples The best way to understand the difference between undefined and undeclared in JavaScript is by having a look at examples. Example 1: Undefined Variable To see an example of
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In JavaScript, there are three types of popup boxes: Here is the syntax for using each of them: This is a complete guide to popups in JavaScript. You will learn how and why to use the three different popup types in JavaScript. The guide shows you simple and illustrative examples. JavaScript Popup Modals Here is
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To remove spaces from a string in Python, use the str.replace() method. This method takes two arguments: For example: Output: This is the quick answer. To learn other useful string methods in Python, feel free to check this article. In this guide, we take a look at other common situations related to removing spaces from
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The __qualname__ attribute means qualified name in Python. It gives you a dotted path to the name of the target object. Using __qualname__ is useful with nested structures, such as when you have a method inside a class. For example: The result of this is a full path to the attribute: __qualname__ vs __name__ in
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To use a while loop to find the factorial of a number in Python: Here is how it looks in code: Let’s test that it works: Output: There you have it! To learn more about factorials and some alternative ways to calculate the factorial, please read along. What Is the Factorial of a Number in
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In Python, a metaclass is a “class of a class”. It defines how a class itself is constructed. Whenever you create a Python class, a metaclass is invoked under the hood. This metaclass turns the class into a Python object. To truly understand what a metaclass is, you need to understand how classes work. In
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The difference between the yield and the return statement in Python is: I’m sure this raises more questions than it answers. Let’s go through yield in Python in great detail. Our goal is to understand why and when should one use yield over the return statement in Python. Generators in Python Any function that yields
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