Javascript add extra argument

Question

Lets take a look at this code:

var mainFunction = function() {
  altFunction.apply(null, arguments);
}

The arguments that are passed to \"mainF

Answer 1

//
//    var
//        altFn  = function () {}, 
//        mainFn = prefilled( altFn  /* ...params */ );
//
//    mainFn(  /* ...params */  );
//  
//        
function prefilled ( fn /* ...params */ ) { 
     return ( function ( args1 ) { 

          var orfn = this;

          return function () { 

              return orfn.apply( this, args1.concat( cslc( arguments ) ) );

          };

     } ).call( fn, cslc( arguments, 1 ) );
}

// helper fn
function cslc( args, i, j ) { 
   return Array.prototype.slice.call( args, i, j );
}


// example

var
    f1 = function () { console.log( cslc( arguments ) ); }, 
    F1 = prefilled( f1, 98, 99, 100 );

F1( 'a', 'b', 'c' );

//
//   logs: [98, 99, 100, "a", "b", "c"]
//
//