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 " Uses the new HistogramMorph"
 | characterFrequency |
 CurrentReadOnlySourceFiles cacheDuring: [
 	characterFrequency := ((CompiledMethod allInstances select: 
 	[:method | (method allLiterals detectSum: 
 	[:lit | lit isCollection ifFalse: [0] ifTrue: [lit size]])  1500])
 	gather: [:method | method getSource
 	reject: [:c |c isSeparator]]) asBag].
 
 (HistogramMorph on: characterFrequency)
 	labelBlock: [:c | c codePoint > 32 ifTrue:[c asString] ifFalse: [c printString]];
 	openInWorld.
 	
 ((characterFrequency sortedCounts collect: [:ea | ea value]) first: 90) join.

Result

• The most frequent (printable) characters are in order

	etarsoinl:

	etarsoinl:cdfumhpg.ybwSv"=1CT'x][0F)(k2ANPI|M^B4O7D6R3598#EL-,zWVjU;H+q/>G@KX${}YQZJ\~?!

• This is quit close to actual English:

	etaonishrlducmwyfgpbvkjxqz

Observations:

• The most frequent punctuation is : and . follows quite long after.
• Cascading is comparatively rare. We have more blocks and equality/identity comparisons than ;
• Blocks are more common than parenthesis and literal arrays
• You cannot spell ifTrue or ifFalse with the 20 most common characters
• ifTrue: is far more common than ifFalse:
• The most frequent uppercase Character is S. I have no conjecture here, tho.

Comparison:

C, sampling the Linux kernel:

	et_risancodlupfm,);(0hvgb-E=x>ITRSACkNL.P1O/wD2My"{}UF&3GB4q86HV5:X#[]+zK7W9Y|%\!jQZ'

• under_score_case vs. camelCase is rather obvious.
• (not displayed but tab and newline are amog the 6 most frequent characters!)
• Punctuation starts much earlier.
• The beginning differs a lot, the ending not so much.
• 0 is far more important than 1
• : is unimportant

Ruby, sampling Rails:

	etsaonridl_cupmh.f:,"gb')(=y#vw/kq>ATx01R[]@S{}CE|2?-zjDMIPN+BO\F3L5!HU%&498GW6;YV7J`X

• underscore shows, but not so much as in C.
• The : is (like in Smalltalk) more important
• Uppercase is more uncommon than in both C and Smalltalk.