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Marijn Haverbeke'sEloquent JS is an excellentbook, here's my solutions to the exercises written in CoffeeScript.

npm install coffeescript -gcoffee 1-triangle.coffee

The golden rule of CoffeeScript is: “It’s just JavaScript.”

As the ES6 train gained a lot of momentumcoffee lost steam. However,the trendsstill show download growth over the past few years and there's still a lot of bigprojects using it.

Version 2 changed the compilation target from ES3 to ES2015 and aligned with newlanguage features like ES2015 Modules, classes, template literals, async / awaitand destructuring. Now that both languages are close to feature parity, the onlycompelling reason to write CoffeeScript is the clean expressive syntax.

I wrote CoffeeScript every day for fours years and then ES6+ for the last two,I've just been reacquainted and it's still a pleasure to program in. Keep an openmind and give it a try, you may enjoy it.

• Clarity of the program shines through with less syntax and significant whitespace
• Everything is an expression, statements likefor,if andswitch produce a value
• Implicitreturn of last statement
• Aliases, operators & shorthands allow for more expressive code