Does CoffeeScript allow JavaScript-style == semantics of equality?

Question

I like that CoffeeScript compiles == into a JavaScript === statement . But what if you want to use the original JS == semantics? Are they available? I looked through the documentation and can not find anything that could be done.

More generally, is there a way to embed plain JS in my CoffeeScript code so the compiler doesn't touch it?

I would prefer to avoid editing compiled JavaScript output, since I use Chirpy to automatically create it in Visual Studio.

Answer 1

As a possible extension for this, is there a way to embed regular JS blocks in CoffeeScript code so that it doesn't compile?

Yes, here is the documentation . You need to wrap the JavaScript code in backticks ( ` ). This is the only way to directly use JavaScript == in CoffeeScript. For example:

CoffeeScript source ^{[ try ]}

 if `a == b` console.log "#{a} equals #{b}!" 

Compiled JavaScript

 if (a == b) { console.log("" + a + " equals " + b + "!"); } 

---

Is the specific case == null / undefined / void 0 served by the postfix extension operator ? :

CoffeeScript source ^{[ try ]}

 x = 10 console.log x? 

Compiled JavaScript

 var x; x = 10; console.log(x != null); 

CoffeeScript Source ^{[ try ]}

 # `x` is not defined in this script but may have been defined elsewhere. console.log x? 

Compiled JavaScript

 var x; console.log(typeof x !== "undefined" && x !== null); 

Answer 2

This is not quite the answer, but this problem arose because of me because jQuery.text () included spaces, and "is" failed in Coffeescript. Work around this with jQuery's trim function:

 $.trim(htmlText) is theExpectedValue