j(*objects) -> nil
与えられたオブジェクトを JSON 形式の文字列で標準出力に一行で出力します。
例 require "json" j([1,2,{"name" => "tanaka","age" => 19}]) # => [1,2,{"name":"tanaka","age":19}]
require "json" j([1,2,{"name" => "tanaka","age" => 19}]) # => [1,2,{"name":"tanaka","age":19}]
[SEE_ALSO] Kernel.#p