Method: Hash#merge!

Defined in:

hash.c

#merge!(other_hash) ⇒ Hash #update(other_hash) ⇒ Hash #merge!(other_hash) {|key, oldval, newval| ... } ⇒ Hash #update(other_hash) {|key, oldval, newval| ... } ⇒ Hash

Adds the contents of other_hash to hsh. If no block is specified, entries with duplicate keys are overwritten with the values from other_hash, otherwise the value of each duplicate key is determined by calling the block with the key, its value in hsh and its value in other_hash.

h1 = { "a" => 100, "b" => 200 }
h2 = { "b" => 254, "c" => 300 }
h1.merge!(h2)   #=> {"a"=>100, "b"=>254, "c"=>300}

h1 = { "a" => 100, "b" => 200 }
h2 = { "b" => 254, "c" => 300 }
h1.merge!(h2) { |key, v1, v2| v1 }
                #=> {"a"=>100, "b"=>200, "c"=>300}

Overloads:

• #merge!(other_hash) ⇒ Hash

  Returns:

  • (Hash)
• #update(other_hash) ⇒ Hash

  Returns:

  • (Hash)
• #merge!(other_hash) {|key, oldval, newval| ... } ⇒ Hash

  Yields:

  • (key, oldval, newval)

  Returns:

  • (Hash)
• #update(other_hash) {|key, oldval, newval| ... } ⇒ Hash

  Yields:

  • (key, oldval, newval)

  Returns:

  • (Hash)

# File 'hash.c', line 2309

static VALUE
rb_hash_update(VALUE hash1, VALUE hash2)
{
    rb_hash_modify(hash1);
    hash2 = to_hash(hash2);
    if (rb_block_given_p()) {
	rb_hash_foreach(hash2, rb_hash_update_block_i, hash1);
    }
    else {
	rb_hash_foreach(hash2, rb_hash_update_i, hash1);
    }
    return hash1;
}