The global value true is the only instance of class TrueClass and represents a logically true value in boolean expressions. The class provides operators allowing true to be used in logical expressions.

Methods
#
T
#
Instance Public methods
true & obj → true or false

And—Returns false if obj is nil or false, true otherwise.

Source: show 

static VALUE
true_and(VALUE obj, VALUE obj2)
{
    return RTEST(obj2)?Qtrue:Qfalse;
}
true ^ obj → !obj

Exclusive Or—Returns true if obj is nil or false, false otherwise.

Source: show 

static VALUE
true_xor(VALUE obj, VALUE obj2)
{
    return RTEST(obj2)?Qfalse:Qtrue;
}
true.to_s → "true"

The string representation of true is “true”.

Source: show 

static VALUE
true_to_s(VALUE obj)
{
    return rb_usascii_str_new2("true");
}
true | obj → true

Or—Returns true. As anObject is an argument to a method call, it is always evaluated; there is no short-circuit evaluation in this case.

true |  puts("or")
true || puts("logical or")

produces:

or

Source: show 

static VALUE
true_or(VALUE obj, VALUE obj2)
{
    return Qtrue;
}