class KeyError

Raised when the specified key is not found. It is a subclass of IndexError.

h = {"foo" => :bar}
h.fetch("foo") #=> :bar
h.fetch("baz") #=> KeyError: key not found: "baz"

(?string msg, ?receiver: R?, ?key: K?) → void

Source

# File vendor/bundle/ruby/4.0.0/gems/rbs-4.0.3/core/errors.rbs, line 162
def initialize: (?string msg, ?receiver: R?, ?key: K?) -> void

Construct a new KeyError exception with the given message, receiver and key.

() → K?

Source

# File vendor/bundle/ruby/4.0.0/gems/rbs-4.0.3/core/errors.rbs, line 170
def key: () -> K?

Return the key caused this KeyError exception.

() → R?

Source

# File vendor/bundle/ruby/4.0.0/gems/rbs-4.0.3/core/errors.rbs, line 178
def receiver: () -> R?

Return the receiver associated with this KeyError exception.