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September 12, 2015 16:27
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This is a translation of the code in Exercise 5.39 (p. 488) of SICP from Scheme into Javascript. Takes a while to wrap your head around. I think it's really really really pretty.
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| (function(n) { | |
| return (function(fact_iter) { | |
| return fact_iter(fact_iter, 1, 1) | |
| })(function(f_i, product, counter) { | |
| return counter > n ? | |
| product : | |
| f_i(f_i, counter * product, counter + 1) | |
| }) | |
| })(5) // returns 5! or 120 |
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