I am very new to JavaScript and still learning the fundamentals. I was completing a JavaScript challenge were i needed to square every number eg. 881 become 64641. My code is below which i am happy with but I have managed to get myself confused by overthinking.
When i do numArray[i] * numArray[i] as they are both strings does JavaScript automatically convert to a number in order for the numbers to square themselves. Did it turn it into a number - square the number - then turn back into a string again. Which is why i have to do Number(squareArray.join(''));
The reason i ask is I know that if you do string * number it turns to a number, i would if something similar happens. If I am wrong please can someone explain so I can understand.
let numArray = num.toString(); //turn number to a string
let squareArray = []; // create an array to save the new values of the string
for (let i = 0; i < numArray.length; i++) { // iterate through the string
squareArray[i] = numArray[i] * numArray[i]; // save the square of the number to the array
}
return Number(squareArray.join('')); // turn the array into a string and then into a number}
Few observations :
Suggestion : Use Array.map() to get square of each number.
Working Demo :
let numArray = [1,2,3,4,5];
const squareArray = numArray.map(item => item * item);
console.log(Number(squareArray.join('')));