instance method

Hash#rassoc

(V) -> [ K, V ]?

rassoc(value) → new_array or nil

static VALUE
rb_hash_rassoc(VALUE hash, VALUE obj)
{
    VALUE args[2];

    args[0] = obj;
    args[1] = Qnil;
    rb_hash_foreach(hash, rassoc_i, (VALUE)args);
    return args[1];
}

Searches self for the first entry whose value is == to the given value; see Entry Order.

If the entry is found, returns its key and value as a 2-element array; returns nil if not found:

Example

h = {foo: 0, bar: 1, baz: 1}
h.rassoc(1) # => [:bar, 1]

Related: see Methods for Fetching.

See also #merge! #rehash #merge #reject also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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