Varied speed iteration controller

Push button controls an iterative loop, the speed of the iteration is controlled by a potentiometer.
Here is the code for your reference:
/*
Developed by Jesse McVaney
Jan. 9, 2014
A sketch for controlling a counter with a single button.
When pushed the button triggers digital pin 2 to begin counting up.
A potentiometer attached to analog pin 0 controls how quickly the upcount progresses
through the use of the delay command. The potentiometer values are mapped into a usable range.
*/
const int potPin = 0; // Potentiometer hooked to analong pin 2
const int button = 2; // The button is outputting to pin 2
int count = 0; // initialize the counter to zero
int pot_value = 0; // The initial value on the potentiometer
int delay_value = 0; // Allows for the map function to scale the potentiometer values
void setup()
{
Serial.begin(9600); // Begin the serial communication
//
pinMode(button, INPUT); // Specify that the button on pin 2 is an input button
}
void loop ()
{
while (digitalRead(button) == HIGH) // while the button is pressed, perform the following loop
{
pot_value = analogRead(potPin);
delay_value = map(pot_value,524,1023,0,1000);
Serial.print("Iteration number = ");
Serial.print(count++);
Serial.print(" || Potentiometer value = ");
Serial.print(pot_value);
Serial.print(" || Delay value = ");
Serial.println(delay_value);
delay(delay_value);
}
}