4 ** See Copyright Notice in mruby.h
8 #include <mruby/array.h>
9 #include <mruby/hash.h>
13 * hsh.values_at(key, ...) -> array
15 * Return an array containing the values associated with the given keys.
16 * Also see <code>Hash.select</code>.
18 * h = { "cat" => "feline", "dog" => "canine", "cow" => "bovine" }
19 * h.values_at("cow", "cat") #=> ["bovine", "feline"]
23 hash_values_at(mrb_state *mrb, mrb_value hash)
25 mrb_value *argv, result;
29 mrb_get_args(mrb, "*", &argv, &argc);
30 result = mrb_ary_new_capa(mrb, argc);
31 ai = mrb_gc_arena_save(mrb);
32 for (i = 0; i < argc; i++) {
33 mrb_ary_push(mrb, result, mrb_hash_get(mrb, hash, argv[i]));
34 mrb_gc_arena_restore(mrb, ai);
41 * hsh.slice(*keys) -> a_hash
43 * Returns a hash containing only the given keys and their values.
45 * h = { a: 100, b: 200, c: 300 }
46 * h.slice(:a) #=> {:a=>100}
47 * h.slice(:b, :c, :d) #=> {:b=>200, :c=>300}
50 hash_slice(mrb_state *mrb, mrb_value hash)
52 mrb_value *argv, result;
55 mrb_get_args(mrb, "*", &argv, &argc);
56 result = mrb_hash_new_capa(mrb, argc);
57 if (argc == 0) return result; /* empty hash */
58 for (i = 0; i < argc; i++) {
59 mrb_value key = argv[i];
62 val = mrb_hash_fetch(mrb, hash, key, mrb_undef_value());
63 if (!mrb_undef_p(val)) {
64 mrb_hash_set(mrb, result, key, val);
71 mrb_mruby_hash_ext_gem_init(mrb_state *mrb)
76 mrb_define_method(mrb, h, "values_at", hash_values_at, MRB_ARGS_ANY());
77 mrb_define_method(mrb, h, "slice", hash_slice, MRB_ARGS_ANY());
81 mrb_mruby_hash_ext_gem_final(mrb_state *mrb)