End of Life Ruby 3.0 has reached end of life and gets no more fixes. Switch to Ruby 4.0 →

instance method

Kernel#lambda

lambda { |...| block } → a_proc

static VALUE
f_lambda(VALUE _)
{
    f_lambda_warn();
    return rb_block_lambda();
}

Equivalent to Proc.new, except the resulting Proc objects check the number of parameters passed when called.

Ruby version changes

3.0
- Kernel#lambda now warns if called without a literal block. [Feature #15973]

See also #JSON #load #jj #local_variables also in 4.1 · 4.0 · 3.4 · 3.3 · 3.2 · 3.1