Technically, foo = function() {} is creating an anonymous function that gets assigned to a variable named foo. outer is not redeclared within the inner function, because it’s already in scope; inner within the function, on the other hand, should not be able to change the value of the external variable of the same name, and therefore has a declaration of its own. Note that the { and } are required for this shorthand. Bugfixes for chained function calls not closing implicit objects or ternaries. Compile and print a little snippet of CoffeeScript directly from the command line. Axed the unsatisfactory ino keyword, replacing it with of for object comprehensions. To step through a range comprehension in fixed-size chunks, use by, for example: You need to provide it with a configuration so that it knows what to do. You can also embed blocks of JavaScript using triple backticks. Comprehensions replace (and compile into) for loops, with optional guard clauses and the value of the current array index. CoffeeScript now supports ES2015-style destructuring defaults. Slices indices have useful defaults. CoffeeScript 0.3 includes major syntax changes: Use of to signal comprehension over the properties of an object instead of the values in an array. Any Stage 3 features that CoffeeScript chooses to support should be considered experimental, subject to breaking changes or removal until the feature reaches Stage 4. While loops can now be used as expressions, in the same way that comprehensions can. Array slice literals and array comprehensions can now both take Ruby-style ranges to specify the start and end. The Wrapper is a software interface/layer between instrument / effect plugins and FL Studio. Loading CoffeeScript in the browser now adds just a single CoffeeScript object to global scope. Hopefully, you’ll never need to use it, but if you ever need to intersperse snippets of JavaScript within your CoffeeScript, you can use backticks to pass it straight through. Bugfix for an edge case where it was possible to create a bound (, Bugfix for incorrect source maps generated when using, Bugfix for comments at the beginning or end of input into the REPL (, Improvements to comments output that should now cover all of the. Destructuring assignment can even be combined with splats. console.log sys.inspect object → console.log(sys.inspect(object)); Functions are defined by an optional list of parameters in parentheses, an arrow, and the function body. Significant whitespace. Correctly compile large hexadecimal numbers literals to, The JavaScript output is a bit nicer, with unnecessary parentheses and spaces, double indentation and double semicolons around. Instead of using curly braces { } to surround blocks of code in functions, if-statements, switch, and try/catch, use indentation. If you need dependencies, or async callbacks, it’s best to put them in your code itself — not the cake task. Some features of ECMAScript are intentionally unsupported. This is helpful when using callback-based libraries like Prototype or jQuery, for creating iterator functions to pass to each, or event-handler functions to use with on.
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