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Documentation for Hash#merge and shallow copies. #228

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Documentation for Hash#merge and shallow copies. #228

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14 changes: 14 additions & 0 deletions hash.c
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Expand Up @@ -1893,6 +1893,20 @@ rb_hash_update_block_i(VALUE key, VALUE value, VALUE hash)
* h2 = { "b" => 254, "c" => 300 }
* h1.merge!(h2) { |key, v1, v2| v1 }
* #=> {"a"=>100, "b"=>200, "c"=>300}
*
* Note that this method creates a shallow copy of the value in
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the values, no?

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Whoops, must have missed this one, do you want to commit this one Mr. Daloze?

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OK, I'll take care of it.

* <i>other_hash</i>. This means that when for example
* <code>Array#select!</code> is used on one of the values in
* <i>other_hash</i> both the original object as well as the copy will
* be modified. This is illustrated in the following example:
*
* original = { 'numbers' => [10, 20, 30] }
* copy = {}.merge(original)
*
* copy['numbers'].select! { |number| number <= 20 }
*
* puts copy # => { 'numbers' => [10, 20] }
* puts original # => { 'numbers' => [10, 20] }
*/

static VALUE
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