Are there legitimate uses for JavaScript's “with” statement?

Question

Alan Storm\'s comments in response to my answer regarding the with statement got me thinking. I\'ve seldom found a reason to use this particular language feature, and had ne

Answer 1

For some short code pieces, I would like to use the trigonometric functions like sin, cos etc. in degree mode instead of in radiant mode. For this purpose, I use an AngularDegreeobject:

AngularDegree = new function() {
this.CONV = Math.PI / 180;
this.sin = function(x) { return Math.sin( x * this.CONV ) };
this.cos = function(x) { return Math.cos( x * this.CONV ) };
this.tan = function(x) { return Math.tan( x * this.CONV ) };
this.asin = function(x) { return Math.asin( x ) / this.CONV };
this.acos = function(x) { return Math.acos( x ) / this.CONV };
this.atan = function(x) { return Math.atan( x ) / this.CONV };
this.atan2 = function(x,y) { return Math.atan2(x,y) / this.CONV };
};

Then I can use the trigonometric functions in degree mode without further language noise in a with block:

function getAzimut(pol,pos) {
  ...
  var d = pos.lon - pol.lon;
  with(AngularDegree) {
    var z = atan2( sin(d), cos(pol.lat)*tan(pos.lat) - sin(pol.lat)*cos(d) );
    return z;
    }
  }

This means: I use an object as a collection of functions, which I enable in a limited code region for direct access. I find this useful.