instance method

Hash#compact

() -> ::Hash[K, V]

compact → new_hash

static VALUE
rb_hash_compact(VALUE hash)
{
    VALUE result = rb_hash_dup(hash);
    if (!RHASH_EMPTY_P(hash)) {
        rb_hash_foreach(result, delete_if_nil, result);
        compact_after_delete(result);
    }
    else if (rb_hash_compare_by_id_p(hash)) {
        result = rb_hash_compare_by_id(result);
    }
    return result;
}

Returns a copy of self with all nil-valued entries removed:

Example

h = {foo: 0, bar: nil, baz: 2, bat: nil}
h.compact # => {foo: 0, baz: 2}

Related: see Methods for Deleting.

See also #compact! #clear #assoc #compare_by_identity also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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