generateRandomPassword()

Step 1: Understand the Requirements

Firstly, we need to understand what a random password generator is. It's a function to generate a random password that contains a mix of alphabets (both lowercase and uppercase), numbers, and special characters. The length of the password is typically variable and defined by the user.

Step 2: Defining the Character Set

To start off, we will define the possible characters that can be included in the password. In Javascript, we define a string of all possible characters.

let lowerCase = 'abcdefghijklmnopqrstuvwxyz';
let upperCase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
let numbers = '0123456789';
let specialChars = '!@#$%^&*()_+~`|}{[]:;?><,./-=';
let allChars = lowerCase + upperCase + numbers + specialChars;

Step 3: Write a Function to Generate Random Character

Next, we need to create a function that will pick a random character from our possible characters string. We can do this by generating a random index within the range of our character set length and return the character at that index.

function getRandomChar(){
    let randomIndex = Math.floor(Math.random() * allChars.length);
    return allChars[randomIndex];
}

Step 4: Write a Function to Generate Password

Now, let's use our getRandomChar function to generate a random password. We will create a function, generateRandomPassword, that takes one argument, password length and then uses a loop to create a string of random characters of that length.

function generateRandomPassword(passwordLength) {
    let password = '';
    for (let i = 0; i < passwordLength; i++) {
        password += getRandomChar();
    }
    return password;
}

Step 5: Testing the Function

Let's test our function with a password length of 16.

console.log(generateRandomPassword(16));

This will print a 16 character long random password to the console.

Conclusion

In Javascript, writing a random password generator involves creating two functions: one for generating a random character and another for generating the password. The full implementation of the function is as follows:

let lowerCase = 'abcdefghijklmnopqrstuvwxyz';
let upperCase = 'ABCDEFGHIJKLMNOPQRSTUVWXYZ';
let numbers = '0123456789';
let specialChars = '!@#$%^&*()_+~`|}{[]:;?><,./-=';
let allChars = lowerCase + upperCase + numbers + specialChars;

function getRandomChar(){
    let randomIndex = Math.floor(Math.random() * allChars.length);
    return allChars[randomIndex];
}

function generateRandomPassword(passwordLength) {
    let password = '';
    for (let i = 0; i < passwordLength; i++) {
        password += getRandomChar();
    }
    return password;
}

console.log(generateRandomPassword(16));

By understanding the requirements and breaking down the problem, we can easily write a program to generate a random password.