Part $2$: Non$-$blocking Delays using millis $()$

Setup:

Same as Part $1.$

Task: Modify the sketch to use the millis$()$ function to toggle the LED every second without blocking the main loop, allowing the pushbutton to be checked during the time intervals.

Code Example:

unsigned long prexiqusMidliss $=0$:

const long interval $=\backslash \backslash \backslash 00$;

void setup$()\{$

pinMOde$(13,$ OUTPUT$)$;

pinMMedes $(2,$ INPUT$)$;

$\}$

void $1000()\{$

unsigned long currentMillis $=$ millis$()$;

if $($currentMidlis $-$ paexigusMidlis $>=$ interval$)\{$

previousMillis $=$ currentMillis;

digitalWrite$(13,!$digitalRead$(13))$; $//$ Toggle LED

$\}$

$//$ Check if button is pressed

if $($digitalRead$(2)==$ HIGH$)\{$

$//$ Add some code to perform some action

$\}$

$\}$

Question: How does using millis$()$ improve the program? What can the Arduino do now that it couldn't with delav$()?$