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2 added 34 characters in body
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Ruby w/J-uby, 88 6 bytes

:++[0,1]++2.*

In J-uby, + on a proc (or a symbol in this case, as symbols can be used as procs in J-uby), defines a recurrence relation. It takes a starter array, and then produces a function that takes n, and then applies itself to the starter array n times, pushing the result to the end and removing the first element. Naturally :+ + [0,1] is a recurrence relation that starts with elements 0, 1 and adds them together n times.

2.* is shorthand for [0,1]

Ruby w/J-uby, 8 bytes

:++[0,1]

In J-uby, + on a proc (or a symbol in this case, as symbols can be used as procs in J-uby), defines a recurrence relation. It takes a starter array, and then produces a function that takes n, and then applies itself to the starter array n times, pushing the result to the end and removing the first element. Naturally :+ + [0,1] is a recurrence relation that starts with elements 0, 1 and adds them together n times.

J-uby, 8 6 bytes

:++2.*

In J-uby, + on a proc (or a symbol in this case, as symbols can be used as procs in J-uby), defines a recurrence relation. It takes a starter array, and then produces a function that takes n, and then applies itself to the starter array n times, pushing the result to the end and removing the first element. Naturally :+ + [0,1] is a recurrence relation that starts with elements 0, 1 and adds them together n times.

2.* is shorthand for [0,1]

1
source | link

Ruby w/J-uby, 8 bytes

:++[0,1]

In J-uby, + on a proc (or a symbol in this case, as symbols can be used as procs in J-uby), defines a recurrence relation. It takes a starter array, and then produces a function that takes n, and then applies itself to the starter array n times, pushing the result to the end and removing the first element. Naturally :+ + [0,1] is a recurrence relation that starts with elements 0, 1 and adds them together n times.