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Coffeescript Require

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The NoPlusPlus is a simple example of this. current community chat Stack Overflow Meta Stack Overflow your communities Sign up or log in to customize your list. I don't know about other browsers. –Andrew Андрей Листочкин Jun 11 '12 at 11:32 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up anObject = {one: 1, two: 2} delete anObject.one anObject.hasOwnProperty("one") # false Any other use, such as deleting variables or function's won't work.

Terms Privacy Security Status Help You can't perform that action at this time. We could say that, as long as the 'array like' object implements push(), we should treat it like an array: anArray?.push? Use '@' instead. Installation To install, make sure you have a working version of the latest stable version of Node and NPM (the Node Package Manager) and then run: npm install -g coffeelint Leave

Coffeescript Require

Extensions As an extension, we wrote a short stanza using tail-rhyme (aabaab) in CoffeeScript that briefly describes some ideas about CoffeeScript error-handling in lieu of standard libraries. "Don't lie awake" "for Fixed correctly reporting line numbers of compilation errors after line 10. In fact, instanceof only returns a correct result for custom made objects, such as CoffeeScript classes. Camel casing class names is a generally accepted way of distinguishing constructor functions - which require the 'new' prefix to behave properly - from plain old functions. # Good!

Also, this may not be an issue, but I wanted to double check anyway. Strict mode usage All you need to do to enable strict checking is start your script or function with the following string: -> "use strict" # ... Warnings in the compiler is a topic that i'd like to see more discussion on. Coffeescript Tutorial str = "Book by #{"#{firstName} #{lastName}".toUpperCase()}" default level: warn no_plusplus This rule forbids the increment and decrement arithmetic operators.

As I mentioned in the introduction, CoffeeScript's awesomeness lies not only in it's syntax, but in it's ability to fix some of JavaScript's warts. Coffeescript Function Reserved words Certain keywords in JavaScript are reserved for future versions of JavaScript, such as const, enum and class. Options

By default, CoffeeLint will help ensure you are writing idiomatic CoffeeScript, but every rule is optional and configurable so it can be tuned to fit your preferred coding style. at Object._base.(anonymous function) [as .iced] (/projectPath/node_modules/iced-coffee-script/lib/coffee-script/coffee-script.js:200:17) at Module.load (module.js:356:32) at Function.Module._load (module.js:312:12) at Module.require (module.js:364:17) at require (module.js:380:17) at Object. (/projectPath/app.js:2:1) at Module._compile (module.js:456:26) at Object.Module._extensions..js (module.js:474:10) at Module.load (module.js:356:32) at

I completely agree with the sentiment, but think this might be out of CoffeeScript's purview. Coffeescript For Loop Implicit braces are always allowed in in class defiinitions, thanks to Omar Khan. In the previous sections we covered some design flaws in JavaScript that CoffeeScript fixes. For example, the following runs absolutely fine, even though wem is defined after it's called: wem(); function wem() {} The is because of function scope.

Coffeescript Function

They're also deprecated and removed from future JavaScript versions. You can also use # noqa as a shortcut for # coffeelint: disable-line See #552 for more details. 1.14.0-1.14.1 - 2015.11.18 Most of the changes are more for linting the development Coffeescript Require aVar = 1 aVar = null Using parseInt JavaScript's parseInt() function can return unexpected results if you pass a string to it without informing it of the proper base. Coffeescript To Javascript default level: error missing_fat_arrows Warns when you use `this` inside a function that wasn't defined with a fat arrow.

tj commented Aug 2, 2013 Yeah fair enough, just a suggestion since coffeescript is supposed to "fix" javascript. tj commented Aug 5, 2013 @epidemian just because you can do it doesn't make it a good practice, just like the weird gotchas that coffeescript attempts to cover up. See #279 Fix for #173: Empty functions surrounded by parens don't require spacing. That's it, just the 'use strict' string. Coffeescript Github

If you want to create a variable in the local scope, JavaScript requires explicitly indicating that fact using the var keyword. Compile time errors will be thrown. your code ... The Little Book on CoffeeScript « Back to all chapters The Bad Parts JavaScript is a tricky beast, and knowing the parts that you should avoid is just as important as

LineLinter: processes one line at a time, usually with regular expressions TokenLinter: processes the token stream generated by CoffeeScript. Coffeescript Switch exception/error occurred The STACKTRACE for the exception/error occurred is :: ReferenceError: y is not defined at Object. (C:\Examples\strings_exceptions\Exception_handling.coffee:3:7) at Object. (C:\Examples\strings_exceptions\Exception_handling.coffee:2:1) at Module._compile (module.js:413:34) at Object.exports.run (C:\Users\Tutorialspoint\AppData\Roaming\npm\node_modules\coffee-script\lib\coffee-script\coffee-script.js:134:23) at compileScript (C:\Users\Tutorialspoint\AppData\Roaming\npm\node_modules\coffee-script\lib\coffee-script\command.js:224:29) at default level: ignore space_operators This rule enforces that operators have spaces around them.

Treating everything as an expression, having a uniform class notation, and array comprehensions are some of the semantic differences (among others) that make me choose CS over JS.

Global variables By default, your JavaScript programs run in a global scope, and by default any variables created are in that global scope. What am I missing? However, due to the fact that CoffeeScript statements have a direct translation into JavaScript, and don't run in a virtual machine or interpreter, the language is not a silver bullet to Coffeescript Class Rules may be loaded using --rules /path/to/rules/ or coffeelint.registerRule(RuleConstructor) when outside of the CLI.

CoffeeScript code, however, can take advantage of the numerous JavaScript libraries available or the browser-specific APIs. Check the main Coffee page, and here's the explanation: - When requiring CoffeeScript files in Node you must now explicitly register the compiler. What's not to like? CoffeeScript solves this by simply replacing all weak comparisons with strict ones, in other words converting all == comparators into ===.

Suffice to say, they have fairly ambiguous behavior, and can lead to problems later down the road. default level: ignore max_line_length This rule imposes a maximum line length on your code. You signed in with another tab or window. The spacing amount is specified by "spaces".

Later these exceptions can be captured and you can take an appropriate action. Browse other questions tagged javascript error-handling coffeescript or ask your own question. x = '1234'; console.log(x) # This semicolon is redundant. Previous Page Print Next Page Advertisements Write for us FAQ's Helping Contact © Copyright 2016.

c:\> coffee Exception_handling_finally.coffee On executing, the CoffeeScript file produces the following output. Another method would be to show some form of an alert/error dialog to the client using the browser API. The solution to this is to either use parenthesis, or add an additional dot. (5).toString(); 5..toString(); Fortunately CoffeeScript's parsers is clever enough to deal with this issue by using double dot You need to watch out for this, be careful that you're not reusing the name of an external variable accidentally if you're writing a deeply nested function or class.

I still think a mechanism like this should be at the JS level :(. Treating everything as an expression, having a uniform class notation, and array comprehensions are some of the semantic differences (among others) that make me choose CS over JS. See #330 for details Linting from STDIN will look for config files. -f option can specify a package.json that contains coffeelintConfig Depricated --no-color in favor of new --color= option Fixed an Thanks to CoffeeScript's developers for a great language (and a re-usable Lexer).

Ah yeah, sorry, I think I was too extreme there. eval can't introduce new variables into the local context Function statements have to be defined before they're used (previously functions could be defined anywhere). tj commented Aug 1, 2013 Yeah, it's certainly questionable but isn't a big goal of coffeescript to help eliminate poor practices? I'm not really sure of this.

default level: error line_endings This rule ensures your project uses only windows or unix line endings. I foresee this change affecting very few people but probably still needs a minor version increase. As Sun Tzu says, "know your enemy", and that's exactly what we're going to do in the chapter, exploring the dark side of JavaScript and revealing all the lurking monsters ready