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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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JavaScript Scope & Hoisting: what determines how your code works? Understanding JavaScript Scope and Hoisting is the difference between writing reliable, debuggable code and creating code that is full of mystery bugs. You’ve probably come across a variable behaving erratically or a function working before it was defined, and you’ve been left scratching your head.
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Understanding javascript Strings and String Methods is key as text appears nearly everywhere in web development. User input, API responses, dynamic content on pages – all represent ways Strings are utilized in handling the vast majority of user visible information. 1. Creating Strings and Basic Properties Javascript Strings are merely sequences of characters. Single character,
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Form Validation in JavaScript: How to Protect Your Apps From Bad Data Protecting your application from incorrect data prior to reaching the server is called learning JavaScript form validation. Any form that allows anything to be entered is a form that will fail. You may have completed a form that stated “Email is required” or
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