It does not matter for the size of the code is const is put in front of

• char variable[ ]= “Text”;
• String variable = “Text”;

or not

true and false
HIGH and LOW

bool test = false;
pinmode (7, INPUT_PULLUP); // Define pen 7 as an input with a pullup so when not connected it is a HIGH
 
if ( test ) { // is the same as
if ( test == 1 ) { // is the same as 
if ( test == true) { // This is the preferred syntax
 
if ( digitalRead(7) ) { // is the same as
if ( digitalRead(7) == 1 ) { // is the same as
if ( digitalRead(7) == HIGH ) { // This is the preferred syntax
 
 
if ( !test ) { // is the same as
if ( test == 0 ) { // is the same as 
if ( test == false) { // This is the preferred syntax
 
if ( !digitalRead(7) ) { // is the same as
if ( digitalRead(7) == 0 ) { // is the same as
if ( digitalRead(7) == LOW ) { // This is the preferred syntax

  test = !test // Test becomes the opposite of itself. From true to false or from flase to true.
               // This is the same as 
  test = test ^ 1 // XOR. This is the same as
  test ^= test // XOR. This is the preferred method. It saves 4 bytes in the executable

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