Squared concatenation of a Number in JavaScript

We are required to write a JavaScript function that takes in a number and returns a new number in which all the digits of the original number are squared and concatenated.

For example: If the number is ?

99

Then the output should be ?

8181

because 9² is 81 and 9² is 81, so concatenating them gives 8181.

Example

Let's implement this function step by step:

const num = 9119;
const squared = num => {
    const numStr = String(num);
    let res = '';
    for(let i = 0; i 

Output

The output in the console will be ?

811181


How It Works

The function works by:

• Converting the number to a string to access individual digits
• Iterating through each character (digit)
• Converting each character back to a number using the unary plus operator (+)
• Calculating the square using Math.pow()
• Concatenating the squared result to the result string

Alternative Approach Using Array Methods

const squaredConcatenation = num => {
    return String(num)
        .split('')
        .map(digit => Math.pow(+digit, 2))
        .join('');
};

console.log(squaredConcatenation(123));
console.log(squaredConcatenation(999));

149
818181

Conclusion

Squared concatenation transforms each digit by squaring it and joining the results. Both the traditional loop and functional array methods produce the same result effectively.