This is a Ruby tree! It shows every object from the Ruby Programming Language in a tree format.

thread_variable? 

        # Thread.thread_variable?

(from ruby core)
---
    thr.thread_variable?(key)   -> true or false

---

Returns `true` if the given string (or symbol) exists as a thread-local
variable.

    me = Thread.current
    me.thread_variable_set(:oliver, "a")
    me.thread_variable?(:oliver)    #=> true
    me.thread_variable?(:stanley)   #=> false

Note that these are not fiber local variables.  Please see Thread#[] and
Thread#thread_variable_get for more details.

This is MURDOC! A Ruby documentation browser inspired by Smalltalk-80. It allows you to learn about Ruby by browsing through its class hierarchies, and see any of its methods.