Random name generator function in JavaScript

We are required to write a JavaScript function that takes in a number n and returns a random string of length n containing no other than the 26 English lowercase alphabets.

Example

Let us write the code for this function:

const num = 8;
const randomNameGenerator = num => {
    let res = '';
    for(let i = 0; i < num; i++){
        const random = Math.floor(Math.random() * 26);
        res += String.fromCharCode(97 + random);
    };
    return res;
};
console.log(randomNameGenerator(num));

Output

Following is the output in the console:

kdcwping

Note: This is one of many possible outputs. Console output is expected to differ every time.

How It Works

The function uses Math.random() to generate random numbers between 0-25, then converts them to ASCII characters:

// Breaking down the logic
console.log("ASCII code for 'a':", 'a'.charCodeAt(0));  // 97
console.log("Random number 0-25:", Math.floor(Math.random() * 26));
console.log("Character from code 97+5:", String.fromCharCode(97 + 5));  // 'f'

ASCII code for 'a': 97
Random number 0-25: 12
Character from code 97+5: f

Alternative Approach Using Array

You can also use a predefined alphabet array for cleaner code:

const randomNameGeneratorArray = num => {
    const alphabet = 'abcdefghijklmnopqrstuvwxyz';
    let result = '';
    for(let i = 0; i < num; i++){
        const randomIndex = Math.floor(Math.random() * alphabet.length);
        result += alphabet[randomIndex];
    }
    return result;
};

console.log(randomNameGeneratorArray(10));
console.log(randomNameGeneratorArray(5));

mxqweropls
jhkdf

Conclusion

Both approaches generate random lowercase strings effectively. The ASCII method is more memory-efficient, while the array approach is more readable and easier to understand.