Both bound functions and arrow functions do not have a prototype property: typeof (function() {}).prototype // ‘object’ as usual typeof (function() {}).bind(null).prototype // ‘undefined’! typeof (() => {}).prototype // ‘undefined’! This is not 100% safe since you could still manually assign this property (although that’d be weird). As such, a simple way to check for … Read more
Take a look at this example, I will define a function printme that takes vargs of type String def printme(s: String*) = s.foreach(println) scala> printme(List(“a”,”b”,”c”)) <console>:9: error: type mismatch; found : List[String] required: String printme(List(a,b,c)) What you really need to un-pack the list into arguments with the :_* operator scala> val mylist = List(“1″,”2″,”3”) scala> … Read more
Javascript isn’t threaded, so a “wait” would freeze the entire page (and probably cause the browser to stop running the script entirely). To specifically address your problem, you should remove the brackets after donothing in your setTimeout call, and make waitsecs a number not a string: console.log(‘before’); setTimeout(donothing,500); // run donothing after 0.5 seconds console.log(‘after’); … Read more
Nowadays this is very easy with PDEP from the BMI2 instruction set. Here is a 64-bit version with some examples: #include <cassert> #include <cstdint> #include <x86intrin.h> inline uint64_t nthset(uint64_t x, unsigned n) { return _pdep_u64(1ULL << n, x); } int main() { assert(nthset(0b0000’1101’1000’0100’1100’1000’1010’0000, 0) == 0b0000’0000’0000’0000’0000’0000’0010’0000); assert(nthset(0b0000’1101’1000’0100’1100’1000’1010’0000, 1) == 0b0000’0000’0000’0000’0000’0000’1000’0000); assert(nthset(0b0000’1101’1000’0100’1100’1000’1010’0000, 3) == 0b0000’0000’0000’0000’0100’0000’0000’0000); assert(nthset(0b0000’1101’1000’0100’1100’1000’1010’0000, … Read more
Nested functions are available as a language extension in GCC, but they are not part of the standard language, so some compilers will not allow them.
Actually a more refined solution is use the build-in function sumif, this function does exactly what you need, will only sum those expenses of a specified month. example =SUMIF(A2:A100,”=January”,B2:B100)
You can calculate the variance in SQL: create table t (row int); insert into t values (1),(2),(3); SELECT AVG((t.row – sub.a) * (t.row – sub.a)) as var from t, (SELECT AVG(row) AS a FROM t) AS sub; 0.666666666666667 However, you still have to calculate the square root to get the standard deviation.
First way is function function1() { var variable1=12; function2(variable1); } function function2(val) { var variableOfFunction1 = val; // Then you will have to use this function for the variable1 so it doesn’t really help much unless that’s what you want to do. } Second way is var globalVariable; function function1() { globalVariable=12; function2(); } function … Read more
You need to use named parameters, like so: myfunc(a, c:5);
Actually, doing arbitrary arity with type classes turns out to be incredibly easy: module Pred where class Predicate a where complement :: a -> a instance Predicate Bool where complement = not instance (Predicate b) => Predicate (a -> b) where complement f = \a -> complement (f a) — if you want to be … Read more