Are these two things equal

eq.coffee

eq = (val1, val2) ->
  i = undefined
  l = undefined
  return true  if val1 is val2
  return false  if typeof val1 isnt typeof val2
  if val1.length and val1.splice and val2.length and val2.splice
    return false  unless val1.length is val2.length
    i = 0
    l = val1.length

    while i < l
      return false  unless eq(val1[i], val2[i])
      i++
    return true
  false

eq.js

function eq( val1, val2 ){
  var i, l;

  if( val1 === val2 ) {
    return true; 
  }
  
  if( typeof val1 !== typeof val2 ) { 
    return false;
  }

  if( val1.length && val1.splice && val2.length && val2.splice ) {
    if( val1.length != val2.length ) {
      return false;
    }

    for( i=0, l=val1.length; i<l; i++ ) {
      if( !eq( val1[i], val2[i] ) ) {
        return false;
      }
    }
    return true;
  }
  return false;
}