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I have doudt, Is scala interpreter(REPL) compiles the command and run by the JVM like how the scalac compiles a program ?
Simply Does it work like any other normal interpreter ?
The standard Scala interpreter, as experienced in the REPL for example, is a variant of the compiler that takes input, wraps it in an invisible object and compiles it on the fly (like any other regular Scala program), then runs the body of that virtual object.
The Scala Meta project might offer a different approach of a more direct interpretation without going through full-to-byte-code compilation.
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I'm learning swift, but i'm not a native english speaker and just want to ask what does 'let' mean? I know its a constant but then why it's not 'cons'?
Is 'let' an abbrevation of some word?
I won't die without knowing it, i'm just curious ;)
Thanks.
There are other languages where let is used as a keyword before a variable declaration, such as BASIC and LISP (or Scheme), and I presume it was taken from there. It's not an abbreviation; it's the normal English word "let", used to introduce a command, as in "Let there be light;" in mathematics it is common to announce a symbol this way, as in "Let x be the unknown number of years we are trying to calculate."
To answer your question a little more fully, though: in my view, there is nothing about this word that makes it particularly suitable for constants. They seems to have made an arbitrary choice. var makes sense for a "variable" that can vary (get it?), so now they just needed another word, and they picked let. Personally, I think const would have been better.
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At my work I wrote a little parser for C-like expressions in one of our in-house Perl tools. I initially chose Parse::RecDescent because of its extreme ease of use and straightforward grammar syntax, but I'm finding that it's excessively slow (which is corroborated by general opinion found on the web). It's safe to assume that the grammar of the expressions is no more complicated than that of C.
What are the fastest (but still with a straightforward and uncumbersome grammar format) lexxer/parser modules for the use case of thousands of simple expressions (I'd guestimate the median length is 1 token, mean is 2 or so, and max is 30)? Additionally, thanks to unsavory IT choices, it must work in Perl 5.8.8 and it and any non-core dependencies must be pure Perl.
Parse::Eyapp looks like satysfying 5.8.8, pure perl and dependency requirements. As for speed, it claims LALR parsers, which must be faster than recursive descent. A grammar for expressions is given in the doc. Hope it helps.
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I have a program reading one file and I want to read multiple files so I wrote a script to read those files and send them to the program (args in main) but some how it is not getting the input. I wanted to know the possible ways that I can send info to args(1).
Instead of piping the files to Java (via |) you should simply invoke your Scala program with the JPG argument appended. (I'm assuming Scala since that's what you have tagged your question with.)
Something like:
scala YourScalaProgram tmp.jpg
assuming that all necessary jars, etc., are on your CLASSPATH.
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If I write a function in a .m file and try to run it by pressing the "run" button, will the function just be set in the environment or also run, maybe without arguments?
If the function does not take any arguments, then it will simply be executed. If the function does take arguments, and you try to run it via the GUI, you should be prompted to enter a set of default arguments that should be used. These arguments will be used if you ever run the script in the future.
This is described in Matlab's documentation here.
There are two types of mfiles (files with .m extension) in Matlab:
Scripts and Functions. (See Scripts vs. Functions)
See Calling a function for how to use a function programmatically.
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is there any pgp key dumping program like http://www.pgpdump.net/ that also shows the MPI values as well as the other information? the linked website's program will print out ... for the long MPI, which is perfectly logical, but I want to see the values since my program is for some reason getting all but one part right (reading an elgamal public key), and its messing with everything that comes afterwards. i want to see where im off by a few bits
gpg --list-packets --debug-all should show MPI values.
pgpdump.net links to the source code of pgpdump. Perhaps you could find the part where ... is written and change it in a local copy of the program.