v.js

gistfile1.js

/*
  v.js
  Is the version that I use ahead from the one I expected ? 
  
  123 bytes
  
  ## Usage 
  v(actual, expected)
     e.g. 
      v("1.2.3", "1.7.3") // false
      v("1.7.3", "1.7.3") // true
      v("1.8.3", "1.7.3") // true
      v("1.8.3", "1.8.10") // false
*/
  
function v(a,b){for(var c=".",d=b.split(c),e=a.split(c),f=0;3>f;f++){if(c=+d[f]-e[f],0>c)return!0;if(c>0)break}return 3==f}

/* explanation */

function v(v, s){
 var r = "." // separator
   , m = s.split(r) 
   , a = v.split(r)
   , i = 0 
 for(;i < 3; i++) { 
   r = (+m[i] - a[i]) // compare versions
   if(r < 0) return !0 // if stricly superior, version is ahead
   if(r > 0) break // if strictly inferior, version is obsolete
  }
  return i == 3 // check if a break occured
}