Js Catch Syntax Error
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caught in JavaScript? up vote 3 down vote favorite 1 MDN states: A SyntaxError is thrown when the JavaScript engine encounters tokens or token order that does not conform to the syntax of the language when parsing code. But if there's a syntax error, how could the program even run in the first place? How can JavaScript syntax errors even be caught? javascript share|improve this javascript error handling best practices question edited Nov 19 '14 at 20:34 asked May 11 '11 at 10:53 Pacerier 30.6k33152278 related: stackoverflow.com/questions/12219154/… –Ciro Santilli 烏坎事件2016六四事件 法轮功 Sep 18 at 23:18 add a comment| 4 Answers 4 active oldest votes up vote 3 down vote accepted It's runtime errors that can be caught with try-catch, not syntax errors (if you eval your code you can handle syntax errors in the evaled code but that's just weird). I'd recommend you read these: https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Statements#try...catch_Statement https://developer.mozilla.org/en/Core_JavaScript_1.5_Guide/Statements#Exception_Handling_Statements share|improve this answer edited Nov 19 '14 at 20:34 Pacerier 30.6k33152278 answered May 11 '11 at 11:01 oberhamsi 909414 1 Your link points to a "content moved" page... –Šime Vidas May 11 '11 at 11:03 +1 on the evaling code into excistance and catching exceptions on the syntax errors being possible, but wonky. –Martijn May 11 '11 at 11:07 hey's that's a broken link –Pacerier May 11 '11 at 11:51 thanks for fixing the links, i added another one ;) –oberhamsi May 12 '11 at 7:56 add a comment| up vote 5 down vote You can catch programmer-generated and runtime exceptions but you cannot catch JavaScript syntax err
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Join the MDN community Report a content problem Report a bug Search Search Languages Català coffeescript try catch (ca) Deutsch (de) Español (es) Français (fr) 日本語 (ja) 한국어 (ko) Português (do Brasil) (pt-BR) Русский (ru) 中文 (简体) (zh-CN) Add a translation Edit Advanced Advanced History Print http://stackoverflow.com/questions/5963045/syntax-errors-can-be-caught-in-javascript this article MDN Web technology For developers JavaScript JavaScript reference Standard built-in objects SyntaxError Your Search Results fscholz Mingun arai Sheppy Potappo Sevenspade SyntaxError In This Article DescriptionSyntaxParametersPropertiesMethodsSyntaxError instancesPropertiesMethodsExamplesCatching a SyntaxErrorCreating a SyntaxErrorSpecificationsBrowser compatibilitySee also The SyntaxError object represents an error when trying to interpret syntactically invalid code. Description A SyntaxError is thrown when the https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/SyntaxError JavaScript engine encounters tokens or token order that does not conform to the syntax of the language when parsing code. Syntax new SyntaxError([message[, fileName[, lineNumber]]]) Parameters message Optional. Human-readable description of the error fileName Optional. The name of the file containing the code that caused the exception lineNumber Optional. The line number of the code that caused the exception Properties SyntaxError.prototype Allows the addition of properties to a SyntaxError object. Methods The global SyntaxError contains no methods of its own, however, it does inherit some methods through the prototype chain. SyntaxError instances Properties SyntaxError.prototype.constructor Specifies the function that created an instance's prototype. SyntaxError.prototype.message Error message. Although ECMA-262 specifies that SyntaxError should provide its own message property, in SpiderMonkey, it inherits Error.prototype.message. SyntaxError.prototype.name Error name. Inherited from Error. SyntaxError.prototype.fileName Path to file that raised this error. Inherited from Error. SyntaxError.prototype.lineNumber Line number in file that raised this error. Inherited from Error. SyntaxError.prototype.columnNumber Column number in line that raised this error. Inherited fr
here for a quick overview of the site Help Center Detailed answers to any questions you might have Meta Discuss the workings and policies of this site About Us Learn more about Stack http://programmers.stackexchange.com/questions/144326/try-catch-in-javascript-isnt-it-a-good-practice Overflow the company Business Learn more about hiring developers or posting ads with us Programmers Questions Tags Users Badges Unanswered Ask Question _ Programmers Stack Exchange is a question and answer site for professional programmers interested in conceptual questions about software development. Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up syntax error and rise to the top try-catch in javascript… isn't it a good practice? up vote 47 down vote favorite 24 There is a provision for try-catch block in javascript. While in java or any other language it is mandatory to have error handling, I don't see anybody using them in javascript for greater extent. Isn't it a good practice or just we don't need them in javascript? javascript error-handling share|improve js catch syntax this question asked Apr 13 '12 at 16:19 akp 4141510 2 While in java or *any other language* it is mandatory to have error handling... - Not really. Java, yes, but there are plenty of languages that don't insist on try-catch (like C#). –Jim G. May 25 '14 at 23:17 It is because you cannot use them in an async environment. I use them often by sync code by a lower abstraction level, for example by transforming something into something, etc... –inf3rno May 26 '14 at 3:27 add a comment| 6 Answers 6 active oldest votes up vote 47 down vote accepted One should avoid throw errors as the way to pass error conditions around in applications. The throw statement should only be used "For this should never happen, crash and burn. Do not recover elegantly in any way" try catch however is used in situation where host objects or ECMAScript may throw errors. Example: var json try { json = JSON.parse(input) } catch (e) { // invalid json input, set to null json = null } Recommendations in the node.js community is that you pass errors around in callbacks (Because errors only occur for asynchronous operations) as the first argument fs.readFile(uri, function (err, fileDa