Download Programming Erlang: Software for a Concurrent World by Joe Armstrong PDF

By Joe Armstrong

Erlang solves some of the most urgent difficulties dealing with builders at the present time: easy methods to write trustworthy, concurrent, high-performance structures. It's used world wide by way of businesses who have to produce trustworthy, effective, and scalable purposes. put money into studying Erlang now.

Moore's legislations is the statement that the volume you are able to do on a unmarried chip doubles each years. yet Moore's legislation is taking a detour. instead of generating swifter and swifter processors, businesses resembling Intel and AMD are generating multi-core units: unmarried chips containing , 4, or extra processors. in case your courses aren't concurrent, they'll simply run on a unmarried processor at a time. Your clients will imagine that your code is gradual.

Erlang is a programming language designed for construction hugely parallel, allotted, fault-tolerant platforms. it's been used commercially for a few years to construct monstrous fault-tolerated platforms that run for years with minimum mess ups.

Erlang courses run seamlessly on multi-core desktops: this implies your Erlang software should still run much quicker on a four middle processor than on a unmarried center processor, all with out you having to alter a line of code.

Erlang combines principles from the area of useful programming with recommendations for construction fault-tolerant structures to make a strong language for construction the vastly parallel, networked functions of the long run.

This ebook provides Erlang and useful programming within the established Pragmatic kind. And it's written by means of Joe Armstrong, one of many creators of Erlang.

It contains instance code you'll have the capacity to construct upon. additionally, the publication includes the complete resource code for 2 attention-grabbing functions: A SHOUTcast server you can use to circulation track to each desktop in your home, and a full-text indexing and seek engine which can index gigabytes of information.

easy methods to write courses that run on dozens or maybe thousands of neighborhood and distant processors. See easy methods to write powerful purposes that run even within the face of community and failure, utilizing the Erlang programming language.

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Additional info for Programming Erlang: Software for a Concurrent World

Sample text

50 B ACK TO S HOPPING Where Do I put Those Semicolons? We use three types of punctuation in Erlang. Commas (,) separate arguments in function calls, data constructors, and patterns. ) (followed by whitespace) separate entire functions and expressions in the shell. Semicolons (;) separate clauses. catch and receive expressions. Whenever we see sets of patterns followed by expressions, we’ll see semicolons as separators: Pattern1 -> Expressions1; Pattern2 -> Expressions2; ... This time the first clause of total matches with the bindings {What → pears, N → 6, T → [{milk,3}]}.

Functions That Return Funs Not only can funs be used as arguments to functions (such as map and filter), but functions can also return funs. Here’s an example—suppose I have a list of something, say fruit: 1> Fruit = [apple,pear,orange]. [apple,pear,orange] Now I can define a function MakeTest(L) that turns a list of things (L) into a test function that checks whether its argument is in the list L: 2> MakeTest = fun(L) -> (fun(X) -> lists:member(X, L) end) end. 56006484> 3> IsFruit = MakeTest(Fruit).

Look through these examples, and make sure you really understand them: Pattern {X,abc} {X,Y,Z} Term {123,abc} {222,def,"cat"} {X,Y} {333,ghi,"cat"} X {X,Y,X} {X,Y,X} true {{abc,12},42,{abc,12}} {{abc,12},42,true} [H|T] [H|T] [A,B,C|T] [1,2,3,4,5] "cat" [a,b,c,d,e,f] Result Succeeds X → 123 Succeeds X → 222, Y → def, Z → "cat" Fails—the tuples have different shapes Succeeds X → true Succeeds X → {abc,12}, Y → 42 Fails—X cannot be both {abc,12} and true Succeeds H → 1, T → [2,3,4,5] Succeeds H → 99, T → "at" Succeeds A → a, B → b, C → c, T → [d,e,f] If you’re unsure about any of these, then try entering a Pattern = Term expression into the shell to see what happens.

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