Use switch. In the worst case the compiler will generate the same code as a if-else chain, so you don’t lose anything. If in doubt put the most common cases first into the switch statement. In the best case the optimizer may find a better way to generate the code. Common things a compiler does … Read more
I’ve seen this idiom used a lot, so you don’t even have to do OS sniffing: try: import json except ImportError: import simplejson as json
EDIT: Here is an update using the Java 8 Streaming API. So much cleaner. Can still be combined with regular expressions too. public static boolean stringContainsItemFromList(String inputStr, String[] items) { return Arrays.stream(items).anyMatch(inputStr::contains); } Also, if we change the input type to a List instead of an array we can use items.stream().anyMatch(inputStr::contains). You can also use … Read more
I don’t think this is possible in Python, since what you’re actually trying to do probably gets expanded to something like this: num1 = 20 if someBoolValue else num1 If you exclude else num1, you’ll receive a syntax error since I’m quite sure that the assignment must actually return something. As others have already mentioned, … Read more
In my experience, tests of the form if (ptr) or if (!ptr) are preferred. They do not depend on the definition of the symbol NULL. They do not expose the opportunity for the accidental assignment. And they are clear and succinct. Edit: As SoapBox points out in a comment, they are compatible with C++ classes … Read more
You can; the null pointer is implicitly converted into boolean false while non-null pointers are converted into true. From the C++11 standard, section on Boolean Conversions: A prvalue of arithmetic, unscoped enumeration, pointer, or pointer to member type can be converted to a prvalue of type bool. A zero value, null pointer value, or null … Read more
As a general rule, most if not all Intel CPUs assume forward branches are not taken the first time they see them. See Godbolt’s work. After that, the branch goes into a branch prediction cache, and past behavior is used to inform future branch prediction. So in a tight loop, the effect of misordering is … Read more
No, it’s not possible (at least not with arbitrary statements), nor is it desirable. Fitting everything on one line would most likely violate PEP-8 where it is mandated that lines should not exceed 80 characters in length. It’s also against the Zen of Python: “Readability counts”. (Type import this at the Python prompt to read … Read more
You have to reimplement it using <xsl:choose> tag: <xsl:choose> <xsl:when test=”$CreatedDate > $IDAppendedDate”> <h2> mooooooooooooo </h2> </xsl:when> <xsl:otherwise> <h2> dooooooooooooo </h2> </xsl:otherwise> </xsl:choose>
Use -a (for and) and -o (for or) operations. tldp.org/LDP/Bash-Beginners-Guide/html/sect_07_01.html Update Actually you could still use && and || with the -eq operation. So your script would be like this: my_error_flag=1 my_error_flag_o=1 if [ $my_error_flag -eq 1 ] || [ $my_error_flag_o -eq 2 ] || ([ $my_error_flag -eq 1 ] && [ $my_error_flag_o -eq 2 … Read more