hsh.fetch(key [, default] ) â obj
hsh.fetch(key) {| key | block } â obj
hsh.fetch(key) {| key | block } â obj
Instance Public methods
Returns a value from the hash for the given key. If the key can't be
found, there are several options: With no other arguments, it will raise an
KeyError exception; if default is given, then that
will be returned; if the optional code block is specified, then that will
be run and its result returned.
1 2 3 4 | h = { "a" => 100, "b" => 200 }h.fetch("a") #=> 100h.fetch("z", "go fish") #=> "go fish"h.fetch("z") { |el| "go fish, #{el}"} #=> "go fish, z" |
The following example shows that an exception is raised if the key is not found and a default value is not supplied.
1 2 | h = { "a" => 100, "b" => 200 }h.fetch("z") |
produces:
1 2 | prog.rb:2:in `fetch': key not found (KeyError) from prog.rb:2 |
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