node --allow-natives-syntax leaky-args.js

leaky-args.js

'use strict';
function leakyArgs (item) {
  var args = Array.prototype.slice.call(arguments, 1);
  var total = item;
  for (var i = 0, length = args.length; i < length; i++) {
    total += args[i] + (300 * 234 * 234234 * 235 * 23433);
  }
  return total;
}


function noLeakyArgs (item) {
  var totalArguments = arguments.length,
      args = new Array(totalArguments - 1),
      a;
  for (a = 1; a < totalArguments; a++) {
    args[a - 1] = arguments[a];
  }
  var total = item;
  for (var i = 0, length = args.length; i < length; i++) {
    total += args[i] + (300 * 234 * 234234 * 235 * 23433);
  }
  return total;
}



function printStatus(fn) {
    switch(%GetOptimizationStatus(fn)) {
        case 1: console.log("Function is optimized"); break;
        case 2: console.log("Function is not optimized"); break;
        case 3: console.log("Function is always optimized"); break;
        case 4: console.log("Function is never optimized"); break;
        case 6: console.log("Function is maybe deoptimized"); break;
    }
}

leakyArgs(10, 1, 2, 3, 4, 5, 6);
%OptimizeFunctionOnNextCall(leakyArgs);

leakyArgs(10, 1, 2, 3, 4, 5, 6);

console.log('Leaky Args:');
printStatus(leakyArgs);

noLeakyArgs(10, 1, 2, 3, 4, 5, 6);
%OptimizeFunctionOnNextCall(noLeakyArgs);

noLeakyArgs(10, 1, 2, 3, 4, 5, 6);

console.log('No Leaky Args:');
printStatus(noLeakyArgs);