method
slice!
v2_5_5 -
Show latest stable
- Class:
Array
slice!(p1, p2 = v2)public
Deletes the element(s) given by an index (optionally up to length elements) or by a range.
Returns the deleted object (or objects), or nil if the index is out of range.
a = [ "a", "b", "c" ] a.slice! (1) #=> "b" a #=> ["a", "c"] a.slice! (-1) #=> "c" a #=> ["a"] a.slice! (100) #=> nil a #=> ["a"]
static VALUE
rb_ary_slice_bang(int argc, VALUE *argv, VALUE ary)
{
VALUE arg1, arg2;
long pos, len, orig_len;
rb_ary_modify_check(ary);
if (argc == 2) {
pos = NUM2LONG(argv[0]);
len = NUM2LONG(argv[1]);
delete_pos_len:
if (len < 0) return Qnil;
orig_len = RARRAY_LEN(ary);
if (pos < 0) {
pos += orig_len;
if (pos < 0) return Qnil;
}
else if (orig_len < pos) return Qnil;
if (orig_len < pos + len) {
len = orig_len - pos;
}
if (len == 0) return rb_ary_new2(0);
arg2 = rb_ary_new4(len, RARRAY_CONST_PTR(ary)+pos);
RBASIC_SET_CLASS(arg2, rb_obj_class(ary));
rb_ary_splice(ary, pos, len, 0, 0);
return arg2;
}
if (argc != 1) {
/* error report */
rb_scan_args(argc, argv, "11", NULL, NULL);
}
arg1 = argv[0];
if (!FIXNUM_P(arg1)) {
switch (rb_range_beg_len(arg1, &pos, &len, RARRAY_LEN(ary), 0)) {
case Qtrue:
/* valid range */
goto delete_pos_len;
case Qnil:
/* invalid range */
return Qnil;
default:
/* not a range */
break;
}
}
return rb_ary_delete_at(ary, NUM2LONG(arg1));
}