instance method

Hash#transform_values

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

[A] () { (V) -> A } -> ::Hash[K, A]

transform_values {|value| ... } → new_hash

transform_values → new_enumerator

static VALUE
rb_hash_transform_values(VALUE hash)
{
    VALUE result;

    RETURN_SIZED_ENUMERATOR(hash, 0, 0, hash_enum_size);
    result = hash_dup_with_compare_by_id(hash);
    SET_DEFAULT(result, Qnil);

    if (!RHASH_EMPTY_P(hash)) {
        transform_values(result);
        compact_after_delete(result);
    }

    return result;
}

With a block given, returns a new hash new_hash; for each pair key/value in self, calls the block with value and captures its return as new_value; adds to new_hash the entry key/new_value:

Example

h = {foo: 0, bar: 1, baz: 2}
h1 = h.transform_values {|value| value * 100}
h1 # => {foo: 0, bar: 100, baz: 200}

With no block given, returns a new Enumerator.

See also #transform_values! #transform_keys! #transform_keys #update also in 4.1 · 3.4 · 3.3 · 3.2 · 3.1 · 3.0

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