Method: BasicObject#==

Defined in:

object.c

#==(other) ⇒ Boolean #equal?(other) ⇒ Boolean #eql?(other) ⇒ Boolean

Equality — At the Object level, #== returns true only if obj and other are the same object. Typically, this method is overridden in descendant classes to provide class-specific meaning.

Unlike #==, the #equal? method should never be overridden by subclasses as it is used to determine object identity (that is, a.equal?(b) if and only if a is the same object as b):

obj = "a"
other = obj.dup

obj == other      #=> true
obj.equal? other  #=> false
obj.equal? obj    #=> true

The #eql? method returns true if obj and other refer to the same hash key. This is used by Hash to test members for equality. For any pair of objects where #eql? returns true, the #hash value of both objects must be equal. So any subclass that overrides #eql? should also override #hash appropriately.

For objects of class Object, #eql? is synonymous with #==. Subclasses normally continue this tradition by aliasing #eql? to their overridden #== method, but there are exceptions. Numeric types, for example, perform type conversion across #==, but not across #eql?, so:

1 == 1.0     #=> true
1.eql? 1.0   #=> false

Overloads:

• #==(other) ⇒ Boolean

  Returns:

  • (Boolean)
• #equal?(other) ⇒ Boolean

  Returns:

  • (Boolean)
• #eql?(other) ⇒ Boolean

  Returns:

  • (Boolean)

# File 'object.c', line 245

VALUE
rb_obj_equal(VALUE obj1, VALUE obj2)
{
    return RBOOL(obj1 == obj2);
}