I have a function with an array of numbers, I want to square it but I want them in the array box like [4,9,16] Each time i try to do that, it throws back a NAN output in the console. The numbers come back listed as in a straight line.

digit = (num) => {
  let digits = String(num).split('').map(Number);
  for (let i = 0; i < digits.length; i  ) {
    let square = Math.pow(digits, 2);
    console.log(square);
  }
};
digit(234);

output : NaN

digit = (num) => {
  let digits = String(num).split('').map(Number);

  for (let i = 0; i < digits.length; i  ) {
    let square = Math.pow(digits[i], 2);
    console.log(square);
  }
};
digit(234);

output : 4 9 16

Is it possible to have my output as [4,9,16]?

CodePudding user response：

What you want to do here is to modify the array in place, so you need to assign the result of Math.pow() to each element of the array.

digit = (num) => {
  let digits = String(num).split("")
  .map(Number);
  for(let i = 0; i < digits.length; i  ) {
    digits[i] = Math.pow(digits[i], 2);
  }
  console.log(digits);
};
digit(234);

<iframe name="sif1" sandbox="allow-forms allow-modals allow-scripts" frameborder="0"></iframe>

After the for loop is done, then each array item will be squared.

CodePudding user response：

Math.pow() expects two inputs, both of which should be numbers (not arrays)

You need to loop through your digits, and push the values to an array.

Something like this:

function digit(num) {
    let digits = String(num).split('')
    .map(Number);
    let square = [] // Define an empty array outside the loop
    for(let i = 0; i < digits.length; i  ){
        square.push(Math.pow(digits[i],2)); //Push each value to the loop
    }
    return square; //Return the modified array after the loop
}

console.log(digit(234)); //Outputs [4, 9, 16]