JavaScript

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. […]

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

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

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

In mathematics, the modulo gives you the remainder of 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

To use Javascript promises in a for loop, use async/await. Here is a code skeleton for the correct approach: This waits for each promiseAction to complete before continuing to the next iteration in the loop. For comparison, here is the incorrect approach you were probably thinking of: In this guide, you learn how async/await works

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

To calculate the average of an array in JavaScript: For example: Output: This is the quick answer. However, if this does not ring any bells, I recommend reading further. In this guide, you learn how to calculate the average of an array of numbers in three different ways: Before jumping into these, let’s make sure

In JavaScript, you can have if-else statements on one line. To write an if-else statement on one line, follow the ternary conditional operator syntax: For example: This is a useful way to compress short and simple if-else statements. It makes the code shorter but preserves the readability. However, do not overuse the ternary operator. Converting