Download E-books Ruby In A Nutshell PDF
By Yukihiro Matsumoto
With Ruby in a Nutshell, Matsumoto deals a pragmatic connection with the gains of this new language together with the command-line suggestions, syntax, integrated variables, services, and plenty of regularly occurring sessions and modules. This consultant covers the present strong model of Ruby (1.6), but is appropriate to the improvement model 1.7 and the following deliberate reliable model 1.8. you'll find a radical description of Ruby's language syntax, and an outline of the middle performance outfitted into the traditional Ruby interpreter, which has greater than 800 integrated tools in forty two sessions and modules.
Ruby reveals its strength via its integrated libraries, and this convenient quantity take you thru the numerous helpful libraries that include the traditional Ruby distribution--from community entry through Http and Cgi programming, to information patience utilizing the Dbm library. This booklet concludes with insurance of the original instruments that include Ruby, together with the debugger, profiler, and irb (or interactive ruby.)
learn how Ruby combines the strengths of different languages, and why it has captured the curiosity of such a lot of open resource programmers. As a part of the winning "in a nutshell" s
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1 Debugger it's not relevant how effortless a language is to exploit, it always comprises a few insects whether it is quite a lot of strains lengthy. to aid care for insects, the traditional distribution of Ruby encompasses a debugger. with a purpose to commence the Ruby debugger, load the debug library utilizing the command-line choice -r debug. The debugger stops prior to the 1st line of executable code and asks for the enter of person instructions. listed here are the debugger instructions: b[reak] [< dossier| class>:]< line| procedure> units breakpoints wat[ch] expression units watchpoints b[reak] monitors breakpoints and watchpoints del[ete] [ n] Deletes breakpoints disp[lay] expression monitors worth of expression undisp[lay] [ n] gets rid of reveal of n c[ont] maintains execution s[tep] [ n] Executes subsequent n strains entering into equipment n[ext] [ n] Executes subsequent n strains stepping over tools w[here] monitors stack body f[rame] Synonym for the place l[ist][<-| n- m>] screens resource traces from n to m up [ n] strikes up n degrees within the stack body down [ n] Moves down n degrees within the stack body fin[ish] Finishes execution of the present technique tr[ace] [on|off] Toggles hint mode off and on q[uit] Exits debugger v[ar] g[lobal] screens worldwide variables v[ar] l[ocal] screens neighborhood variables v[ar] i[instance] item screens example variables of item v[ar] c[onst] item screens constants of item m[ethod] i[instance] item screens example tools of item m[ethod] type| module screens example tools of the category or module th[read] l[ist] screens threads th[read] c[ur[rent]] screens present thread th[read] n Stops specific thread th[read] cease n> Synonym for th[read] n th[read] c[ur[rent]] n> Synonym for th[read] n th[read] resume n> Resumes thread n p expression Evaluates the expression h[elp] monitors aid message < every thing else> Evaluates the expression the next is a pattern consultation that indicates the debugger's output whilst it executes the Sieves of Eratosthenes software (a well-known set of rules to calculate top numbers). The interface is designed equally to that of gdb. % ruby -r debug sieve. rb a hundred Debug. rb Emacs help to be had. sieve. rb:2:max = Integer(ARGV. shift || a hundred) (rdb:1) checklist [-3, 6] in sieve. rb 1 => 2 max = Integer(ARGV. shift || a hundred) three sieve =  four for i in 2 .. max five sieve[i] = i 6 finish (rdb:1) checklist [7, sixteen] in sieve. rb 7 eight for i in 2 .. Math. sqrt(max) nine subsequent until sieve[i] 10 (i*i). step(max, i) do |j| eleven sieve[j] = nil 12 finish thirteen finish 14 places sieve. compact. sign up for ", " (rdb:1) b eight Set breakpoint 1 at sieve. rb:8 (rdb:1) c Breakpoint 1, toplevel at sieve. rb:8 sieve. rb:8:for i in 2 .. Math. sqrt(max) (rdb:1) p sieve [nil, nil, 2, three, four, five, 6, 7, eight, nine, 10, eleven, 12, thirteen, 14, 15, sixteen, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35, 36, 37, 38, 39, forty, forty-one, forty two, forty three, forty four, forty five, forty six, forty seven, forty eight, forty nine, 50, fifty one, fifty two, fifty three, fifty four, fifty five, fifty six, fifty seven, fifty eight, fifty nine, 60, sixty one, sixty two, sixty three, sixty four, sixty five, sixty six, sixty seven, sixty eight, sixty nine, 70, seventy one, seventy two, seventy three, seventy four, seventy five, seventy six, seventy seven, seventy eight, seventy nine, eighty, eighty one, eighty two, eighty three, eighty four, eighty five, 86, 87, 88, 89, ninety, ninety one, ninety two, ninety three, ninety four, ninety five, ninety six, ninety seven, ninety eight, ninety nine, a hundred] (rdb:1) del 1 (rdb:1) b 14 Set breakpoint 2 at sieve.