method

flatten!

v1_8_6_287 - Show latest stable - 0 notes - Class: Array

flatten!() public

Flattens self in place. Returns nil if no modifications were made (i.e., array contains no subarrays.)

   a = [ 1, 2, [3, [4, 5] ] ]
   a.flatten!   #=> [1, 2, 3, 4, 5]
   a.flatten!   #=> nil
   a            #=> [1, 2, 3, 4, 5]

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/*
 *  call-seq:
 *     array.flatten! -> array or nil
 *  
 *  Flattens _self_ in place.
 *  Returns <code>nil</code> if no modifications were made (i.e.,
 *  <i>array</i> contains no subarrays.)
 *     
 *     a = [ 1, 2, [3, [4, 5] ] ]
 *     a.flatten!   #=> [1, 2, 3, 4, 5]
 *     a.flatten!   #=> nil
 *     a            #=> [1, 2, 3, 4, 5]
 */

static VALUE
rb_ary_flatten_bang(ary)
    VALUE ary;
{
    long i = 0;
    int mod = 0;
    VALUE memo = Qnil;

    while (i<RARRAY(ary)->len) {
        VALUE ary2 = RARRAY(ary)->ptr[i];
        VALUE tmp;

        tmp = rb_check_array_type(ary2);
        if (!NIL_P(tmp)) {
            if (NIL_P(memo)) {
                memo = rb_ary_new();
            }
            i += flatten(ary, i, tmp, memo);
            mod = 1;
        }
        i++;
    }
    if (mod == 0) return Qnil;
    return ary;
}

flatten!

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