In JavaScript, the dollar sign ($) and underscore (_) are both identifiers—similar to any other name, like myCar or houseAge. You can use a dollar sign or underscore to identify objects, such as: Thus, the dollar sign and underscore are not treated like other special symbols (such as the dot) in JavaScript. The dollar sign […]
JavaScript Dollar Sign ($) and Underscore (_) Explained Read More »
The easiest way to return multiple values in JavaScript is by returning an array of multiple elements. Then, you can access the returned values like this: If you were looking for a quick answer, then there you have it! But to write clean code, the above isn’t always the best way to return two values.
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To get the current URL of the page you are visiting using JavaScript, access the window.location.href property: Alternatively, you can access the current URL via document.URL property. However, it has some shortcomings that I’ll explain in a bit. Let’s take a closer look at the window.location object. It has useful properties other than the href
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In JavaScript, the double exclamation operator converts an Object to Boolean. This happens such that “falsy” objects become false and “truthy” objects become true. For example: This is a comprehensive guide on the double exclamation point operator. About the Double Exclamation Operator: It’s Not an Operator The double exclamation operator (!!) is actually the not
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To get the current timestamp in JavaScript, call the Date.now() function. For example: Output: If that’s what you were looking for, then thanks for reading! If you are interested, the following sections teach you some insight into the significance of timestamps. You will also learn alternative ways to obtain the current timestamp in JavaScript. What
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To change an HTML class using JavaScript, access the classList attribute of an element and do one of the following: Here are some examples: Changing the HTML class happens this way because an HTML element can have multiple classes. Notice that these approaches do not work with Internet Explorer versions before v10. This is an
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In mathematics, the modulo gives you the remainder in the division. To calculate the remainder in the division in JavaScript, use the modulo operator (%). For example: Output: You can interpret this as sharing 10 slices of pizza with 3 eaters. As a result of a fair share, there will be one leftover slice. This
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In JavaScript, the difference between the == operator and === operator is in how the comparison is made: A great way to see this is by comparing a number and a string that represents the same number: As it turns out, the == operator converts the comparables to a common type before making a comparison.
== vs === in JavaScript: What’s the Difference? (with Examples) Read More »
The main difference between let and var in JavaScript is: This means you can have multiple let variables with the same name as long as they live in different scopes, such as in different functions. For instance: In addition to this, there is a bunch of important differences, such as hoisting. These are important to
“let” vs “var” in JavaScript: A Comprehensive Guide (Examples) Read More »
In JavaScript, the array is an extremely commonly used data type. You can use an array in a variety of tasks to store and access values with ease. Some common tasks you want to do with arrays include: And so much more. The Array data structure comes with a bunch of helpful built-in methods. You
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