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CoffeeScript

CoffeeScript is JavaScript with different syntax. All types, methods, etc. are the same as JavaScript. We will only cover the differences between CoffeeScript and JavaScript.

  • Function Declaration
challenge = (x, y, z) ->
  x + y + z
  • Logging
challenge = (x, y, z) ->
  console.log x*y, y*z
  x + y + z
  • No curly braces - use indentation instead
  • Implicit return - no need to write return at the end of a function
  • Parentheses required around function arguments for only one argument
# CoffeeScript
f = (n) ->  # `f = n ->` is not allowed
  x = n + 1
  x / 2     # return value of `f`
  • function calls need no parentheses - can also chain without parentheses if using tagged template literals
(str.repeat 4         ) == (str.repeat(4))
(str.split"x".join"y" ) == (str.split("x").join("y"))
(str.split "x".join"y") == (str.split("x".join("y")))
  • No ternary - analogue is x = if p then a else b but that is long
  • List comprehension
  • String interpolation is "a#{myVar}b"
  • until loop - means while !condition
  • No var - no global variables