diff --git a/vlib/compiler/comptime.v b/vlib/compiler/comptime.v
index 443a360b39..d552b391c9 100644
--- a/vlib/compiler/comptime.v
+++ b/vlib/compiler/comptime.v
@@ -318,3 +318,43 @@ fn (p mut Parser) gen_struct_str(typ Type) {
 	// This function will get parsee by V after the main pass.
 	p.cgen.fns << 'string ${typ.name}_str();'
 }
+
+fn (p mut Parser) gen_array_filter(str_typ string, method_ph int) {
+	/*
+		// V
+		a := [1,2,3,4]
+		b := a.filter(it % 2 == 0)
+		
+		// C
+		array_int a = ...;
+		array_int tmp2 = new_array(0, 4, 4);
+		for (int i = 0; i < a.len; i++) {
+			int it = ((int*)a.data)[i];
+			if (it % 2 == 0) array_push(&tmp2, &it);
+		}
+		array_int b = tmp2;
+	*/
+	val_type:=str_typ.right(6)
+	p.open_scope()
+	p.register_var(Var{
+		name: 'it'
+		typ: val_type
+	})
+	p.next()
+	p.check(.lpar)
+	p.cgen.resetln('')
+	tmp := p.get_tmp()
+	a := p.expr_var.name
+	p.cgen.set_placeholder(method_ph,'\n$str_typ $tmp = new_array(0, $a .len,sizeof($val_type));\n')
+	p.genln('for (int i = 0; i < ${a}.len; i++) {')
+	p.genln('$val_type it = (($val_type*)${a}.data)[i];')
+	p.gen('if (')
+	p.bool_expression()
+	p.genln(') array_push(&$tmp, &it);')
+	//p.genln(') array_push(&$tmp, &((($val_type*)${a}.data)[i]));')
+	//p.genln(') array_push(&$tmp, ${a}.data + i * ${a}.element_size);')
+	p.genln('}')
+	p.gen(tmp) // TODO why does this `gen()` work?
+	p.check(.rpar)
+	p.close_scope()
+}
diff --git a/vlib/compiler/parser.v b/vlib/compiler/parser.v
index 59ef9547bb..8d8ee519f7 100644
--- a/vlib/compiler/parser.v
+++ b/vlib/compiler/parser.v
@@ -2105,43 +2105,7 @@ fn (p mut Parser) dot(str_typ_ string, method_ph int) string {
 	}
 	field_name := p.lit
 	if field_name == 'filter' && str_typ.starts_with('array_') {
-		/*
-			// V
-			a := [1,2,3,4]
-			b := a.filter(it % 2 == 0)
-			
-			// C
-			array_int a = ...;
-			array_int tmp2 = new_array(0, 4, 4);
-			for (int i = 0; i < a.len; i++) {
-				int it = ((int*)a.data)[i];
-				if (it % 2 == 0) array_push(&tmp2, &it);
-			}
-			array_int b = tmp2;
-		*/
-		val_type:=str_typ.right(6)
-		p.open_scope()
-		p.register_var(Var{
-			name: 'it'
-			typ: val_type
-		})
-		p.next()
-		p.check(.lpar)
-		p.cgen.resetln('')
-		tmp := p.get_tmp()
-		a := p.expr_var.name
-		p.cgen.set_placeholder(method_ph,'\n$str_typ $tmp = new_array(0, $a .len,sizeof($val_type));\n')
-		p.genln('for (int i = 0; i < ${a}.len; i++) {')
-		p.genln('$val_type it = (($val_type*)${a}.data)[i];')
-		p.gen('if (')
-		p.bool_expression()
-		p.genln(') array_push(&$tmp, &it);')
-		//p.genln(') array_push(&$tmp, &((($val_type*)${a}.data)[i]));')
-		//p.genln(') array_push(&$tmp, ${a}.data + i * ${a}.element_size);')
-		p.genln('}')
-		p.gen(tmp) // TODO why does this `gen()` work?
-		p.check(.rpar)
-		p.close_scope()
+		p.gen_array_filter(str_typ, method_ph)
 		return str_typ
 	}