Web Reference: CoffeeScript's existential operator ? returns true unless a variable is null or undefined, which makes it analogous to Ruby's nil? so of course this will say "No taco!": taco = undefined if taco? console.log "fiesta!" else . console.log "No taco!" Your taco is explicitly undefined so taco? is false. The accessor variant of the existential operator ?. can be used to soak up null references in a chain of properties. Use it instead of the dot accessor . in cases where the base value may be null or undefined. CoffeeScript's existential operator ? returns true unless a variable is null or undefined, which makes it analogous to Ruby's nil? Behind the scenes CoffeeScript will check previously defined variables like this: and if variable haven't been defined previously like this:
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