bga

function repeatStringBinary(str, how_many)
{
  how_many|=0; // convert to number and round
  str+=""; // convert to string
  
  if(how_many<=0 || str.length==0)
    return "";
  if(how_many==1)
    return str;
  if(how_many==2)

bga

function repeatString(str, how_many)
{
  how_many|=0; // convert to number and round
  str+=""; // convert to string
  
  if(how_many<=0 || str.length==0)
    return "";
  if(how_many==1)
    return str;
  if(how_many==2)

bga

// Sorry. Hack fail :(
// "Speedup" in opera and chrome because bugs in webkit (compile return undefined)
// and opera (invalid regexp object return).
// Giant thanks to @jdalton and @diegoperini
var i,n=20000;
var i=0;
var t="";

for(i=0;i<10000;++i)
  t+=" a";

bga

var i,n=300000;

var d0=new Date().getTime();
for(i=0;i<n;++i)
  "1.5"-0;    
alert("-0: "+(new Date().getTime()-d0)+" ms");

var d0=new Date().getTime();
for(i=0;i<n;++i)
    +"1.5";