A whitespace-significant Lisp, in CoffeeScript, for funsies.
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Syrup, a syntactically-light LISP

fib = fn: [n]
    calc-fib = fn: [n a b]
        if: (n == 0)
            calc-fib: (n - 1) b (a + b)
    calc-fib: n 0 1

print: fib: 10


Syrup is whitespace-significant. Function calls are made by a colon following an atom. All subsequent arguments on a line are passed to the function until a newline of the same indentation, the end of a parenthetical, or a period .

print: "Cool language x" 5000  # Parses as (print "Cool language x" 5000)
print:                         # Equivalent
    "Cool language x"
print: square: 5; square: 6;   # "25", "36"

Parentheses are for disambiguation, and are insignificant. Commas are allowed, but not required.

calc-fib: (n - 1) b (a + b)
calc-fib: n - 1, b, a + b

Vector (array) syntax is like JavaScript's array literals. Vectors are not executed as functions.

[5 6 7 8] # equivalent to list: 5 6 7 8

Quoting uses `.

print: `apples                 # prints "apples"

Infix notation is supported for arithmetic operations and for the assign operator:

5 + 6                          # these two lines are
(+: 5 6)                       # equivalent
test = fn: [] print: 'hi'      # declares the function 'test'

Macros are supported:

unless = macro: [cond t f]
  [`if cond f t]

print: unless: true "false value" "true value"

Object literals can be defined using quoted strings or string variables as keys (as in python). Any arguments after the first passed to a string function have their properties copied to the new object literal. Finally, curly-braces combine all listed objects into one.

"a": 1                         # JSON: {"a": 1}
("some" + "key"): "val"        # JSON: {"somekey": "val"}
obj = "b": 2 "c": 3            # parses to ("b" 2 ("c" 3)) and JSON: {"b": 2, "c": 3}
obj2 = {"a": 1, obj}           # parses to (combine ("a", 1) obj) and JSON: {"a": 1, "b": 2, "c": 3}


REPL, and lots more bikeshedding.