Understanding let x = (5 == 5 || 5 < 2);

What actually happens

The parentheses (5 == 5 || 5 < 2) are an expression. Inside the parentheses:

• 5 == 5 evaluates to true
• 5 < 2 evaluates to false
• The logical OR operator || returns true if either side is true.

Finally:

That line assigns the boolean value true to the variable x.

In other words, the code is saying:
“Assign to x the result of checking whether 5 is equal to 5 or less than 2.”
i.e.,
“Set x to true if 5 == 5 or 5 < 2 — otherwise set it to false.”