CoffeeScript

CoffeeScript

Must know

1. Variables
2. Safety closure
3. Functions

• implicit return, calling with objects, calling with multiple callbacks

1. No coercion issues is is alway ===
2. Loops, while, for v in arr, for k, v of ob, for own k, v of ob
3. Binding function aka Fat arrow =>
4. Everything is an expression

numbers = for i in [0..10]
  i * 2

1. Classes and prototypes
2. Works well with plain Javascript

Nice things

1. Existential Operator foo?.bar
2. Destructing Assignment {Foo} = require "bar", [host, port] = getConfig
3. List Comprehensions (i for i in [0..100] when i > 50)
4. and, or, is, isnt, not instead of ===, &&, || etc.
5. Multiline strings. Regexp too.
6. String interpolation. "I have #{ variable }"
7. Array slicing numbers[numbers.length/2...numbers.length]