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JavaScript error handling may not be glamorous, however, it is perhaps one of the most important aspects of web development. If you have ever sat staring at a blank white screen waiting for an app to load after deployment; or sat watching a user struggle to complete a task because a single failed API request […]
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Writing code for the web prior to 2015 using JavaScript likely involved a great deal of struggle. Prior to the release of JavaScript ES6 features (a major update), many developers were forced to battle “var hoisting” issues, concatenate strings with an unending number of “+” signs, and write long and cumbersome function expressions which cluttered
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Javascript local storage is One of those hidden gems of the browser that really helps bring the modern web application to life in terms of being able to personalize and offer a smoother overall experience. If you’ve ever returned to a website that had saved your preferences (like switching between light/dark modes), or if you’ve
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JavaScript Fetch API is the modern standard for creating network Requests inside browsers. Have you ever written confusing xmlhttprequest code with nested callback routines? Then i’m sure you were aware of why the programming community cheered when fetch finally came around. Fetch isn’t just replacing the older Way; it changes entirely how we think about
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When I look at JavaScript async/await I am reminded of how nice it would have been had I understood its power sooner. There are so many people who have had to waste hours untangling through then blocks or debugging a promise chain that swallowed their error silently. JavaScript async/await was made available in ES2017 to
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Creating and working with JavaScript promises can be somewhat of a trial by fire. The moment you have had to wrestle with network requests, timers, etc., you have probably experienced that pyramidal horror where your code has indented so far to the right that it appears to fall off the left side of the screen.
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Understanding the nature of JavaScript closures is an accomplishment that fundamentally alters how you write and think about code. While closures may appear as some sort of mysterious entity, they really are just functions that “remember” their environment of origin. You’ve likely utilized closures before without being aware of doing so. For example, whenever you
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JavaScript callbacks are important to support the asynchronous operations such as user interactions (e.g., mouse clicks), network requests (e.g., loading images or making API calls), timers (e.g., setTimeout()), and reading files. Callbacks are functions that you pass as parameters to other functions. These receiving functions will execute the callback functions at some point in the
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Step #1: Adding event Listeners – The core of JavaScript event handling Adding event Listeners is perhaps the most critical part of javascript event handling. Using addEventListener(), a developer can assign a function to a DOM element. Upon occurrence of a particular event (such as “click”, “submit”, etc.), this assigned function will be called by
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Modifying DOM elements is how you make a static page responsive to user interaction, data and time. After you select an element, you can essentially change nearly anything about it. Have you ever clicked a button that caused some text to show up? Have you changed themes and seen colors alter? Or have you submitted
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