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Task/Call-a-function/CoffeeScript/call-a-function.coffee

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+# Calling a function that requires no arguments
+foo()
+
+# Calling a function with a fixed number of arguments
+foo 1
+
+# Calling a function with optional arguments
+# (Optional arguments are done using an object with named keys)
+foo 1, optionalBar: 1, optionalBaz: 'bax'
+
+# Calling a function with a variable number of arguments
+# for a function `foo` defined as `foo = ( args... ) ->`
+foo 1, 2, 3, 4
+
+# Calling a function with named arguments
+# (Named arguments are done using an object with named keys)
+foo bar: 1, bax: 'baz'
+
+# Using a function in statement context
+x = foo 1
+
+# Using a function in first-class context within an expression
+# (For `foo` defined as `foo = ( x ) -> x + 1`
+x = [ 1, 2, 3 ].map foo
+
+# Obtaining the return value of a function
+x = foo 1
+
+# Arguments are passed by value, even objects. Objects
+# are passed as the _value_ of the reference to an object.
+# Example:
+bar = ( person ) ->
+    # Since `person` is a reference
+    # to the person passed in, we can assign
+    # a new value to its `name` key.
+    person.name = 'Bob'
+
+    # Since `person` is just the value of
+    # the original reference, assigning to it
+    # does not modify the original reference.
+    person = new Person 'Frank'
+
+# Partial application is only possible manually through closures
+curry = ( f, fixedArgs... ) ->
+    ( args... ) -> f fixedArgs..., args...
+
+# Example usage
+add = ( x, y ) -> x + y
+
+add2 = curry add, 2
+
+add2 1 #=> 3