Re: Understanding dotimes skipping by 2

[Van L]

> - Note also the use of `(1+ x)' instead of (+ x 1). Though  honestly I don't 
> know what the difference really is. It's just  the idiom I'm used to.

The 1+ syntactic sugar seems to cost performance by needing more lines of code 
and it is less general in power to process the argument list if it were to be 
extended like (+ x 1 2 3). There is no '(+1 x)' implemented in src/data.c

Could 1+ be an infix plus operator crutch?

  ┌────
  │  1  DEFUN ("1+", Fadd1, Sadd1, 1, 1, 0,
  │  2         doc: /* Return NUMBER plus one.  NUMBER may be a number or a 
marker.
  │  3  Markers are converted to integers.  */)
  │  4    (register Lisp_Object number)
  │  5  {
  │  6    CHECK_NUMBER_OR_FLOAT_COERCE_MARKER (number);
  │  7  
  │  8    if (FLOATP (number))
  │  9      return (make_float (1.0 + XFLOAT_DATA (number)));
  │ 10  
  │ 11    XSETINT (number, XINT (number) + 1);
  │ 12    return number;
  │ 13  }
  └────

  ┌────
  │ 1  DEFUN ("+", Fplus, Splus, 0, MANY, 0,
  │ 2         doc: /* Return sum of any number of arguments, which are numbers 
or markers.
  │ 3  usage: (+ &rest NUMBERS-OR-MARKERS)  */)
  │ 4    (ptrdiff_t nargs, Lisp_Object *args)
  │ 5  {
  │ 6    return arith_driver (Aadd, nargs, args);
  │ 7  }
  └────