method

rindex

v1_8_6_287 - Show latest stable - 1 note - Class: Array

rindex(p1) public

Returns the index of the last object in array == to obj. Returns nil if no match is found.

   a = [ "a", "b", "b", "b", "c" ]
   a.rindex("b")   #=> 3
   a.rindex("z")   #=> nil

Show source

/*
 *  call-seq:
 *     array.rindex(obj)    ->  int or nil
 *  
 *  Returns the index of the last object in <i>array</i> 
 *  <code>==</code> to <i>obj</i>. Returns <code>nil</code> if
 *  no match is found.
 *     
 *     a = [ "a", "b", "b", "b", "c" ]
 *     a.rindex("b")   #=> 3
 *     a.rindex("z")   #=> nil
 */

static VALUE
rb_ary_rindex(ary, val)
    VALUE ary;
    VALUE val;
{
    long i = RARRAY(ary)->len;

    while (i--) {
        if (i > RARRAY(ary)->len) {
            i = RARRAY(ary)->len;
            continue;
        }
        if (rb_equal(RARRAY(ary)->ptr[i], val))
            return LONG2NUM(i);
    }
    return Qnil;
}

May 26, 2012 - (v1_9_3_125)

0 thanks

rindex with identically array elements

Code Example

a = [1,1,1]
a.rindex( a.min ) #=> 2

rindex

Related methods

rindex with identically array elements

Code Example