You could check every option. if (compare === “page1” || compare === “page2”) { Or you could use an array and check with an existential quantifier like Array#some against, like if ([“page1”, “page2”].some(a => a === compare)) { var compare = “page3”; if (compare === “page1” || compare === “page2”) { document.body.innerHTML = “github url”; … Read more
This is very simple … it means that no results were returned from your query. You always have to code defensively and check to see if the Rows array has any items in it before trying to index into it. Something like: if (dt.Rows.Count > 0) soptype = dt.Rows[0][“SOPTYPE”].ToString(); else somethingWentWrong();
Basically it’s following the rules of section 15.25 of the JLS, specifically: Otherwise, if the second and third operands have types that are convertible (§5.1.8) to numeric types, then there are several cases: […] Otherwise, binary numeric promotion (§5.6.2) is applied to the operand types, and the type of the conditional expression is the promoted … Read more
From the Java Language Specification: The Java programming language, like C and C++ and many programming languages before them, arbitrarily decrees that an else clause belongs to the innermost if to which it might possibly belong.
a = next(i for i in userInput if i in wordsTask) To break it down somewhat: [i for i in userInput if i in wordsTask] Will produce a list. What you want is the first item in the list. One way to do this is with the next function: next([i for i in userInput if … Read more
C++17 if constexpr Oh yes, it has arrived: main.cpp #include <cassert> #include <type_traits> template<typename T> class MyClass { public: MyClass() : myVar{0} {} void modifyIfNotConst() { if constexpr(!isconst) { myVar = 1; } } T myVar; protected: static constexpr bool isconst = std::is_const<T>::value; }; int main() { MyClass<double> x; MyClass<const double> y; x.modifyIfNotConst(); y.modifyIfNotConst(); assert(x.myVar … Read more
For generic SQL you can use CASE: CASE is used to provide if-then-else type of logic to SQL. Its syntax is: SELECT CASE (“column_name”) WHEN “condition1” THEN “result1” WHEN “condition2” THEN “result2” … [ELSE “resultN”] END FROM “table_name” From http://www.sqlite.org/lang_expr.html section “The CASE expression” E.g. UPDATE pages SET rkey = rkey + 2, lkey = … Read more
Rust does not have the ternary operator because it’s not needed. Almost everything evaluates to some value, and if / else expressions are no exception: let r = 42.42; let sgn_r = if r >= 0. { 1. } else { -1. }; You’ll note that I’ve also changed your variable names to be idiomatic … Read more
The operators == and != do not compare the type. Therefore PHP automatically converts ‘Hello’ to an integer which is 0 (intval(‘Hello’)). When not sure about the type, use the type-comparing operators === and !==. Or better be sure which type you handle at any point in your program.