testing javascript setTimeout args, bind, scope.

setTimeout-args-bind-scope.md

x=10;
function test(){
  var x=20;
  var obj = {x:30};
  function logargs(t,arg1,arg2,arg3,arg4) { 
    console.log(`(${t}) this.x=${this.x},x=${x},obj.x=${obj.x},${arg1},${arg2},${arg3},${arg4.x}`); 
  }
  logargs("A",this.x,x,obj.x,obj);
  setTimeout(logargs,0,"B",this.x,x,obj.x,obj);
  setTimeout(logargs.bind(obj),0,"C", this.x, x,obj.x,obj);
  x+=1;
  obj.x+=1;
  this.x+=1;
}
test();
test();

results in

"(A) this.x=10,x=20,obj.x=30,10,20,30,30"
"(A) this.x=11,x=20,obj.x=30,11,20,30,30"
"(B) this.x=12,x=21,obj.x=31,10,20,30,31"
"(C) this.x=31,x=21,obj.x=31,10,20,30,31"
"(B) this.x=12,x=21,obj.x=31,11,20,30,31"
"(C) this.x=31,x=21,obj.x=31,11,20,30,31"