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Task/Benfords-law/CoffeeScript/benfords-law.coffee

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+fibgen = () ->
+    a = 1; b = 0
+    return () ->
+        ([a, b] = [b, a+b])[1]
+
+leading = (x) -> x.toString().charCodeAt(0) - 0x30
+
+f = fibgen()
+
+benford = (0 for i in [1..9])
+benford[leading(f()) - 1] += 1 for i in [1..1000]
+
+log10 = (x) -> Math.log(x) * Math.LOG10E
+
+actual = benford.map (x) -> x * 0.001
+expected = (log10(1 + 1/x) for x in [1..9])
+
+console.log "Leading digital distribution of the first 1,000 Fibonacci numbers"
+console.log "Digit\tActual\tExpected"
+for i in [1..9]
+    console.log i + "\t" + actual[i - 1].toFixed(3) + '\t' + expected[i - 1].toFixed(3)