On Dec 11, 12:32 am, Gerard flanagan <[EMAIL PROTECTED]> wrote: > Xah Lee wrote: > > On Dec 10, 2:47 pm, John W Kennedy <[EMAIL PROTECTED]> wrote: > >> Xah Lee wrote: > >>> In lisp, python, perl, etc, you'll have 10 or so lines. In C or Java, > >>> you'll have 50 or hundreds lines. > [...] > > > Thanks to various replies. > > > I've now gather code solutions in ruby, python, C, Java, here: > > > • A Example of Mathematica's Expressiveness > > http://xahlee.org/UnixResource_dir/writ/Mathematica_expressiveness.html > > > now lacking is perl, elisp, which i can do well in a condensed way. > > It'd be interesting also to have javascript... > > mmm, stone soup... > > javascript: > > var map = function(fn, a) { > var b = new Array(a.length); > for (i = 0; i < a.length; i++) { > b[i] = fn(a[i]); > } > return b > > }; > > var reduce = function(fn, a, init) { > var s = init; > for (i = 0; i < a.length; i++) { > s = fn(s, a[i]); > } > return s > > }; > > var sum = function(a) { > return reduce(function(x, y) { return x + y }, a, 0.0) > > }; > > var norm = function(a) { > var pow = Math.pow; > return Math.sqrt(sum(map(function(x) { return pow(x, 2) }, a))) > > }; > > var Unit = function(a) { > var N = norm(a); > return map(function(x) { return x/N }, a) > > };
thats about 15 lines. I'm pretty sure JavaScript doesn't need that many? Xah ∑ http://xahlee.org/ ☄ -- http://mail.python.org/mailman/listinfo/python-list
