This article will explain how to add (or subtract) days, minutes, hours, seconds (etc.) to a JavaScript date. Why would you want to do this? Perhaps you want to tell a user that their assignment is due in a week and provide the date, or… Read More »Add Days (or Minutes, or Hours) to Javascript Date [or Subtract]
The JavaScript eval() function executes a string as JavaScript. This is a massive security risk as, if used in production, it can allow third parties to execute their own code in your app. eval() Syntax eval(string) Note that: string is a string that contains JavaScript Code eval() will return… Read More »Javascript eval() Function (and Why to NEVER Use It)
let, var, and const are all JavaScript statements that assign a value to a variable. Their behavior can differ depending on how and where they are used in your code – read on to find out the details. Scopes in JavaScript As you start to build more complex applications, you’ll start… Read More »Assign Variables, Global Variables and Scopes in JavaScript (let, var, const)
There are several ways to create text that spans multiple lines in JavaScript – so here they are! Method 1: Backticks This is the best method, so it goes first. It is only compatible with ECMAScript 6 and onwards, so it is only for use in… Read More »Creating Multiline Strings in JavaScript [With Examples]
Being able to concatenate (join) two or more strings together is pretty useful – you may be combining user input for storage in a single database column or doing the reverse – combining data from multiple database columns into a single string for display or output.… Read More »Concatenating (Joining) Strings in JavaScript [3 Methods]
Here’s a guide on checking whether a string contains another string in the JavaScript programming language using the includes() method. includes() Syntax string.includes(search, start) Note that: string should be a string value or variable search should be the string you are checking for start is the index (position) you… Read More »Javascript String includes() Method – Check if a String Contains Another String
This tutorial explains how to use the try/catch/finally statements in Javascript to handle errors, with some useful examples. Sometimes an error is expected – and rather than wanting the application to halt execution on the error; you want to do something else. Other times, an… Read More »Using JavaScript try/catch/finally Statements [With Examples]
We have covered removing items from arrays in JavaScript, as well as checking whether an item is present in an array. This article will look at copying or returning a subsection of arrays using the slice() method in Javascript. slice() Syntax arr.slice([start[, end]]) Where: arr is an array or existing… Read More »Array slice() Method in JavaScript, with Examples
Want to make a string all lower case in JavaScript? It’s the toLowerCase() method to the rescue! The toLowerCase() method is part of the string object and has full support in all browsers. In JavaScript, strings can either be a primitive or an object – primitives are the most basic kinds of variables,… Read More »Using JavaScript ‘toLowerCase()’ String Method [with Examples]
In this guide, we explain how to measure the length of a string in JavaScript using the length method. JavaScript is a flexible programming language that runs just about everywhere. You can run JavaScript apps in web browsers, build command-line apps you can run in… Read More »Measuring the Length of a String in JavaScript, with Examples