End of Life Ruby 3.1 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →
instance method
Hash#default_proc=
hash.default_proc = proc → proc
hash.c
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VALUE
rb_hash_set_default_proc(VALUE hash, VALUE proc)
{
VALUE b;
rb_hash_modify_check(hash);
if (NIL_P(proc)) {
SET_DEFAULT(hash, proc);
return proc;
}
b = rb_check_convert_type_with_id(proc, T_DATA, "Proc", idTo_proc);
if (NIL_P(b) || !rb_obj_is_proc(b)) {
rb_raise(rb_eTypeError,
"wrong default_proc type %s (expected Proc)",
rb_obj_classname(proc));
}
proc = b;
SET_PROC_DEFAULT(hash, proc);
return proc;
}
Sets the default proc for self to proc: (see Default Values):
Example
h = {} h.default_proc # => nil h.default_proc = proc { |hash, key| "Default value for #{key}" } h.default_proc.class # => Proc h.default_proc = nil h.default_proc # => nil