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It is quite easy to migrate from CoffeeScript to ES6. You can use decaffeinate to convert your CoffeeScript source to modern JavaScript. Install decaffeinate globally: npm install -g decaffeinate

CoffeeScript and JavaScript (ECMAScript) both have operators in and of. Each language use them for more than one purpose. There is not a single case where the same operator can...

...purpose in both languages. Check if an object (or its prototype) has a property CoffeeScript var hasFoo = 'foo' of object JavaScript var hasFoo = 'foo' in object; Iterate through all properties...