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