Be concise.
Be useful.
All contributions dictatorially edited by webmasters to match personal tastes.
Please do not paste any copyright violating material.
Please try to avoid dependencies to third-party libraries and frameworks.
c = sum(p(v) for v in x)
c=count(p(x))p has to be an elemental function with an argument of the type of x.
c := 0
for _, v := range x {
if p(v) {
c++
}
}func count[T any](x []T, p func(T) bool) int {
c := 0
for _, v := range x {
if p(v) {
c++
}
}
return c
}This generic func works for any type parameter T
c := 0;
for el in x do if p(el) then Inc(c);my $c = grep { p($_) } @x;grep iterates over list @x and calls function p() on $_ (the context variable). If p() yields true, then the list member is counted. In list context, the members would be returned. In scalar context, only the count is returned. $c is a scalar,