var a = 0; function foo(b) { a = arguments; } foo(1,2,3,42); var r1 = a[0]==1 && a[1]==2 && a[2]==3 && a[3]==42 && a.length==4; foo.call(undefined,1,2,3,42); var r2 = a[0]==1 && a[1]==2 && a[2]==3 && a[3]==42 && a.length==4; result = r1 && r2;