unshift(...)
public
Prepends objects to the front of array. other elements up one.
a = [ "b", "c", "d" ]
a.unshift("a")
a.unshift(1, 2)
/*
* call-seq:
* array.unshift(obj, ...) -> array
*
* Prepends objects to the front of <i>array</i>.
* other elements up one.
*
* a = [ "b", "c", "d" ]
* a.unshift("a") #=> ["a", "b", "c", "d"]
* a.unshift(1, 2) #=> [ 1, 2, "a", "b", "c", "d"]
*/
static VALUE
rb_ary_unshift_m(argc, argv, ary)
int argc;
VALUE *argv;
VALUE ary;
{
long len = RARRAY(ary)->len;
if (argc == 0) return ary;
/* make rooms by setting the last item */
rb_ary_store(ary, len + argc - 1, Qnil);
/* sliding items */
MEMMOVE(RARRAY(ary)->ptr + argc, RARRAY(ary)->ptr, VALUE, len);
MEMCPY(RARRAY(ary)->ptr, argv, VALUE, argc);
return ary;
}