The example Fibonacci is not responsive most of the times

[DartBot]

This issue was originally filed by guilhermeorti...@gmail.com

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What steps will reproduce the problem?

1. At dartland.org, choose the example Fibonacci.
2. Instead of 20, as a parameter for the function Fib, use 50.

What is the expected output? What do you see instead?
I was expecting a numeric output generated by the function. Instead, the page freezes or crashes.

What version of the product are you using? On what operating system?
n/a. Google Chrome on Windows 7

Please provide any additional information below.

[DartBot]

This comment was originally written by kand...@gmail.com

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Fibonacci grows exponentially as a geometric power, the difference between 30 and 50 is orders of magnitude, and thus of course you don't see the result because it takes a very long time to compute. Try learning how to open the Task Manager and checking the CPU usage or write a print statement to find out what fibonacci you are on.
What a stupid bug report... trash it.

[DartBot]

This comment was originally written by drfibonacci@google.com

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Um, yes, the example code is the recursive algorithm, which blows up quickly for n>35. In fact, Google App Engine system status page uses this algorithm as a compact way to tax the CPU for measurement purposes. Personally, the example bothers me because it's too verbose. With Dart, you can easily compute the nth Fibonacci # in exactly 34 characters (granted, spacing is a bit arbitrary):

f(n) => n<2 ? n : f(n-2) + f(n-1);

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Added Invalid label.