method

rindex

v1_9_1_378 - Show latest stable - Class: Array

rindex(p1 = v1)

public

Returns the index of the last object in array

to obj. If a block is given instead of an

argument, returns first object for which block is true. Returns nil if no match is found.

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

static VALUE
rb_ary_rindex(int argc, VALUE *argv, VALUE ary)
{
    VALUE val;
    long i = RARRAY_LEN(ary);

    if (argc == 0) {
        RETURN_ENUMERATOR(ary, 0, 0);
        while (i--) {
            if (RTEST(rb_yield(RARRAY_PTR(ary)[i])))
                return LONG2NUM(i);
            if (i > RARRAY_LEN(ary)) {
                i = RARRAY_LEN(ary);
            }
        }
        return Qnil;
    }
    rb_scan_args(argc, argv, "01", &val);
    while (i--) {
        if (rb_equal(RARRAY_PTR(ary)[i], val))
            return LONG2NUM(i);
        if (i > RARRAY_LEN(ary)) {
            i = RARRAY_LEN(ary);
        }
    }
    return Qnil;
}

rindex

to obj. If a block is given instead of an

Related methods