jashkenas--coffeescript/test/test_operations.coffee

# CoffeeScript's operations should be chainable, like Python's.
ok 500 > 50 > 5 > -5

ok true is not false is true is not false

ok 0 is 0 isnt 50 is 50

ok 10 < 20 > 10

ok 50 > 10 > 5 is parseInt('5', 10)


# Make sure that each argument is only evaluated once, even if used
# more than once.
i: 0
func: -> i++

ok 1 > func() < 1


# `:` and `=` should be interchangeable, as should be `==` and `is`.
a: 1
b: 1

ok a is 1 and b is 1
ok a == b
ok a is b


# Ensure that chained operations don't cause functions to be evaluated more
# than once.
val: 0
func: -> val: + 1

ok 2 > (func null) < 2
ok val is 1


# Allow "if x not in y"
obj: {a: true}
ok 'a' of obj
ok 'b' not of obj

# And for "a in b" with array presence.
ok 100 in [100, 200, 300]
array: [100, 200, 300]
ok 100 in array
ok 1 not in array

list: [1, 2, 7]
result: if list[2] in [7, 10] then 100 else -1
ok result is 100

# And with array presence on an instance variable.
obj: {
  list: [1, 2, 3, 4, 5]
  in_list: (value) -> value in @list
}
ok obj.in_list 4
ok not obj.in_list 0

# Non-spaced values still work.
x: 10
y: -5

ok x*-y is 50
ok x*+y is -50