Overview of Event Handling and Password Generation Logic

Web applications become interactive through events – user actions like clicking a button, typing into a field, checking a box, etc. In React, we handle events by attaching event handler functions to elements. For example, a button can have an onClick attribute that points to a function, or an input field can have an onChange handler.

In our project:

• We will handle the onChange event on the input field for length and on each checkbox. These will call functions (or inline arrow functions) to update the state with the new values (e.g., update the length, or toggle a true/false for including symbols).  
• The onClick event on the "Generate Password" button will trigger a function generatePassword() that we will define. This function contains the core password generation logic.

Password Generation Logic:

We create a pool of characters and then randomly pick from it:

• First, build a string of possible characters (charset) based on selected options. For example, if the user wants uppercase, lowercase, and numbers, our charset might be "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789". If symbols are also included, we add something like "!@#$%^&*()" to the pool.  
• Then, to construct a password of length N, we run a loop N times. In each iteration, we pick a random character from charset. We can get a random index by using Math.random() and Math.floor(). Math.random() gives a random number between 0 and 1, and by multiplying it by the length of the charset and flooring it, we get a valid index to pick a character. We append that character to our password string.  
• After the loop, we have a random password composed of the selected character types. We then update the state password with this new string, so the UI displays it.