For example, compression or minification could cause your valid code to throw an error because those programs may rely on semicolons.Īlso, it can be harder to debug without semicolons since your code may be concatenating together without you realizing it. If you're going to write your JavaScript without optional semicolons, it's probably good to at least know what ASI is doing.
Note: You do need one after: do while (.) Here are a few cases where you don't need semicolons:
So, if parsing a new line of code right after the previous line of code still results in valid JavaScript, ASI will not be triggered. Here are 3 main points to be aware of when it comes to ASI.ġ- A semicolon will be inserted when it comes across a line terminator or a '}' that is not grammatically correct. Below I highlight the main takeaways from these resources. I also found a blog post from Bradley Braithwaite on the topic. I found a helpful lecture from Fullstack Academy on the topic, which you can check out here. ASI doesn’t mean that actual semicolons are inserted into your code, it’s more of a set of rules used by JavaScript that will determine whether or not a semicolon will be interpreted in certain spots. The reason semicolons are sometimes optional in JavaScript is because of automatic semicolon insertion, or ASI. I decided to look more into semicolon usage in JavaScript to truly understand why we would or would not want to use them, and use this knowledge to avoid creating any bad habits early on. JS Graphics JS Graphics JS Canvas JS Plotly JS Chart.js JS Google Chart JS D3.During one of our first JavaScript lectures at the Flatiron School, the instructor mentioned that semicolons are optional in JavaScript… except when they’re not 🤔 JS vs jQuery jQuery Selectors jQuery HTML jQuery CSS jQuery DOM JS JSON JSON Intro JSON Syntax JSON vs XML JSON Data Types JSON Parse JSON Stringify JSON Objects JSON Arrays JSON Server JSON PHP JSON HTML JSON JSONP JS AJAX AJAX Intro AJAX XMLHttp AJAX Request AJAX Response AJAX XML File AJAX PHP AJAX ASP AJAX Database AJAX Applications AJAX Examples JS Web APIs Web API Intro Web Forms API Web History API Web Storage API Web Worker API Web Fetch API Web Geolocation API JS Browser BOM JS Window JS Screen JS Location JS History JS Navigator JS Popup Alert JS Timing JS Cookies JS HTML DOM DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM Forms DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists JS Async JS Callbacks JS Asynchronous JS Promises JS Async/Await JS Classes Class Intro Class Inheritance Class Static JS Functions Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Bind Function Closures JS Objects Object Definitions Object Properties Object Methods Object Display Object Accessors Object Constructors Object Prototypes Object Iterables Object Sets Object Maps Object Reference JS Tutorial JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words
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