method

hash

v1_9_3_392 - Show latest stable - Class: Object

hash()

public

Generates a Fixnum hash value for this object. This function must have the property that a.eql?(b) implies a.hash == b.hash. The hash value is used by class Hash. Any hash value that exceeds the capacity of a Fixnum will be truncated before being used.

"waffle".hash #=> -910576647

VALUE
rb_obj_hash(VALUE obj)
{
    VALUE oid = rb_obj_id(obj);
#if SIZEOF_LONG == SIZEOF_VOIDP
    st_index_t index = NUM2LONG(oid);
#elif SIZEOF_LONG_LONG == SIZEOF_VOIDP
    st_index_t index = NUM2LL(oid);
#else
# error not supported
#endif
    st_index_t h = rb_hash_end(rb_hash_start(index));
    return LONG2FIX(h);
}

hash

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