Stack Overflow Weekly Newsletter - Tuesday, March 31, 2015

Top new questions this week: Why is 0[0] syntactically valid? Why is this line valid in javascript ? var a = 0[0]; After that, a is undefined. javascript   asked by Michael 55 votes answered by jfriend00 73 votes Why does this Java 8 lambda fail to compile? The following Java code fails to compile: @FunctionalInterface private interface BiConsumer<A, B> { void accept(A a, B b); } private static void takeBiConsumer(BiConsumer<String, ... java lambda compiler-errors java-8 void   asked by Brian Gordon 41 votes answered by assylias 51 votes Is it more efficient to perform a range check by casting to uint instead of checking for negative values? I stumbled upon this piece of code in .NET's List source code: // Following trick can reduce the range check by one if ((uint) index >= (uint)_size) { ... c# performance micro-optimization numeric-conversion range-checking   asked by enzi 30 votes answered by Damien_The_Unbeliever 27 votes Why does toString fail to produce the correct value on an immutable BigDecimal? import java.math.BigDecimal; import java.math.RoundingMode; public class BigDecimalTest { public static void main (String[] args) { // 4.88...e+888 (1817 digits) BigDecimal x = new ... java bigdecimal   asked by MikeM 29 votes answered by Marco13 17 votes Confusing sizeof(char) by ISO/IEC in different character set encoding like UTF-16 Assuming that a program is running on a system with UTF-16 encoding character set. So according to The C++ Programming Language - 4th, page 150: A char can hold a character of the machine's ... c++ sizeof utf-16   asked by kembedded 22 votes answered by paxdiablo 25 votes Python class scoping rules EDIT: Looks like this is a very old "bug" or, actually, feature. See, e.g., this mail I am trying to understand the Python scoping rules. More precisely, I thought that I understand them but then I ... python scoping   asked by ivanl 22 votes answered by Antti Haapala 6 votes Java synchronisation: atomically moving money across account pairs? How to make moving money from one account to another atomic? For: public class Account { public Account(BigDecimal initialAmount) {...} public BigDecimal getAmount() {...} public void ... java multithreading   asked by gavenkoa 22 votes answered by Petr 20 votes Greatest hits from previous weeks: Force Git to overwrite local files on pull How do I force an overwrite of local files on a Git pull? The scenario is following: A team member is modifying the templates for a website we are working on He is adding some images to the images ... git version-control git-pull git-fetch   asked by Jakub Troszok 1751 votes answered by Jakub Troszok 79 votes Get selected value in dropdown list using JavaScript? How do I get the selected value from a dropdown list using JavaScript? I tried the methods below but they all return the selected index instead of the value: var as = document.form1.ddlViewBy.value; ... javascript html-select   asked by Danferd Lan 532 votes answered by Paolo Bergantino 1033 votes Can you answer these? A list whose "Nil" carries a value? Does some standard Haskell library define a data type like this data ListWithEnd e a = Cons a (ListWithEnd e a) | End e That is a list whose terminating element carries a value ... list haskell data-structures   asked by Petr Pudlák 8 votes WinDbg loses connection debugging over network, and target machine freeze I'm trying to get WinDbg debugging over the network to work, but it always loses connections after I break into the debugger (Debug->Break), and then try to start it again (Debug->Go). However, if I ... debugging windbg kernel-mode   asked by tchau.dev 6 votes How can I pass RTS options to runghc? For ghci, I can limit the memory ghci can use by $ ghci +RTS -M10m -RTS When I compile the whole program, I can $ ghc -rtsopts a.hs then $ ./a +RTS -M10m How can I do this for runghc a.hs? ... haskell ghc   asked by Yosh 7 votes

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