Hash#compact!

hash.compact! → self or nil

static VALUE
rb_hash_compact_bang(VALUE hash)
{
    st_index_t n;
    rb_hash_modify_check(hash);
    n = RHASH_SIZE(hash);
    if (n) {
        rb_hash_foreach(hash, delete_if_nil, hash);
        if (n != RHASH_SIZE(hash))
            return hash;
    }
    return Qnil;
}

Returns self with all its nil-valued entries removed (in place):

Example

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

Returns nil if no entries were removed.

See also #compact #compare_by_identity #clear #compare_by_identity? also in 4.1 · 4.0 · 3.4 · 3.2 · 3.1 · 3.0

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