Programming-Idioms

Implementation
Scheme

Be concise.

Be useful.

All contributions dictatorially edited by webmasters to match personal tastes.

Please do not paste any copyright violating resource.

Please try to avoid dependencies to third-party libraries and frameworks.

Implementation edit is for fixing errors and enhancing with metadata.

Instead of changing the code of the snippet, consider creating another Scheme implementation.

Other implementations
y := make([]T, 0, len(x))
for _, v := range x{
	if p(v){
		y = append(y, v)
	}
}
val y = x.filter(p)
var y = x.stream().filter(p).collect(Collectors.toList());
y = filter(p, x) 
# You can use a subroutine as your predicate
@primes_less_than_100 = grep { is_prime($_) } 1 .. 99;

# You can also write your predicate inline
@odd_numbers = grep { $_%2 == 1 } 1 .. 99;
y = x.filter(p);
let y: Vec<_> = x.iter().filter(p).collect();
function p($element) {  /* .... */ }

$y = array_filter ($x, "p");
import std.algorithm;
auto y = [1, 2, 3, 4, 5].filter!(a => a%2==0);
import std.algorithm.iteration;
auto y = x.filter!(p);
var y = x.where(p).toList();
function Filter(vv:integer):boolean;

begin
  result :=  vv mod 2= 0;
end;

type TFilter=function(v:integer):boolean;

function FilteredArray(const x:TBoundArray;p:TFilter):TBoundArray;
var
  Idx: Integer;
  v : Integer;

begin
  setlength(result,high(x)+1);
  Idx := 0;
  for v in x do
    if p(v) then
    begin
      result[Idx] := v;
      inc(Idx);
    end;
  setlength(result,Idx);
end;
[...]
  y := FilteredArray(x,@Filter);
y = filter p x
y = x.select(&:p)
y = Enum.filter(x, p)
Y = [I || I <- X, P(X)].
Y = lists:filter(P, X).
y = {}
for _, v in ipairs(x) do
	if p(v) then y[#y+1] = v end
end
var y = x.FindAll(p);
for Item of X loop
   if P (Item) then
      Y.Append (Item);
   end if;
end loop;
#include <algorithm>
#include <iterator>
std::copy_if (x.begin (), x.end (), std::back_inserter(y), p);
(def y (filter p x))
(setf y (remove-if-not p x))
y = [element for element in x if p(element)]
y = pack(x,mask=p(x))
val y = x.filter(p)
y = for item <- x, p.(item), do: item