Javascript

In this tutorial, let’s look at how to truncate a string in JavaScript. We’re going to be looking at using the ‘slice’, ‘splice’, ‘split’ and other pre-defined functions in JavaScript, as well as manual methods using the ‘for’ loop. Let’s get to it then! Check if the string is already within the limit Before we … Read more

In this tutorial, let’s look at the different ways to check if a value exists in an object using JavaScript. We’re going to be looking at a combination of straight-forward (directly searching through the list of values) and roundabout methods (searching via the list of properties). Using Object.values One of the easiest ways to check … Read more

In this tutorial, let’s look at how to replace an item in an array in JavaScript. We’ll be looking at multiple methods, from 1. simple methods that directly use the index to, 2. pre-defined JavaScript methods like splice, fill and slice and finish things off with 3. roundabout methods that involve loops and string conversions. … Read more

In this tutorial, let’s look at the different ways to check if a JavaScript value is an array. We’re not just stopping at the usual ‘typeof’ operator. We’re going to go deeper than that. Using the typeof operator In JavaScript, if you’d like to find the type of any value, the typeof operator is the … Read more

In this tutorial, we’re going to be looking at the different ways to add leading zeros to a number in JavaScript. Sometimes, your program might require your numbers to have a set number of digits. Other times, you might be required to add a set number of leading zeros to fulfil a purpose. In those … Read more

In this tutorial, let’s learn all about different loops, how they occur, how to stop them once they occur, but also how to prevent them from occurring altogether. What are infinite loops? As the name implies, infinite loops are loops that run with no end. The most used loops are the ‘for’ and ‘while’ loops, … Read more

In this tutorial, we’re going to look at how to check if an array is empty in JavaScript. We’re going to start with the simplest method of using the ‘length’ property, but we’re not going to stop there. We’re also going to be looking at various other pre-defined array methods, including those that work alone … Read more

In this tutorial, we’ll be looking at the different ways to empty an array in JavaScript. We’ll look at manipulating the length, assigning empty arrays to the original array, using various other pre-defined array methods, and looping through the array. Set the array’s length to 0 One of the easiest ways to reset an array … Read more

In this tutorial, let’s look at the different ways of adding an item to the beginning of an array in JavaScript. We’re going to be looking at both mutable (operations that change the value of the original array) and immutable (operations that create a copy with the changed values, so the original array remains intact) … Read more

In this tutorial, we’re going to look at the different ways of capitalizing the first letter in JavaScript, so let’s get right into it then. Use String index and the substring method To start with, let’s use the string index and the substring method. As you know, strings start from an index of 0 that … Read more