double2int.js

// http://jsperf.com/double2int
function double2int=function(x){
  if(isNaN(x)) 
    return 0;
  if(x==Infinity||x>0x7fffffff) 
    return 0x7fffffff;
  if(x==-Infinity||x<-0x80000000) 
    return -0x80000000;
  return x|0;
};

function double2int=function(x){
  if(x!==x) 
    return 0;
  if(x>0x7fffffff) 
    return 0x7fffffff;
  if(x<-0x80000000) 
    return -0x80000000;
  return x|0;
};

function double2int=function(x) {
  return Math.min(Math.max(x, -0x80000000), 0x7fffffff)|0
};