ab = new ArrayBuffer(1000*4);

u32 = new Uint32Array(ab);

fnConstructor = function(localArr, localCount) {

    return function foo() {

      for (let i = 0; i < localCount; i++) {

        localArr[localCount]++;

      }

    }

};

​

code2 = `return function foo(argArr, argCount) {

  for (let i = 0; i < argCount; i++) {

    argArr[argCount]++;

  }

}`;

fnWithArgs = new Function(code2)();