Make all numbers in array Absolute value in Javascript

Question

I'm trying to make all values in the below array absolute, after trying several methods the results that appears is 5 the first element in the array. the below is the code given:

describe('absoluteValueArray', () => {
    it('Gets multiple absolute values', () => {
      const result = absoluteValueArray([-5,-50,-25,-568])
      expect(result).toEqual([5,50,25,568])
    })
  })

Function I tried is the below:

const absoluteValueArray = (array) => {

    var index, len;
    var array = ["-5", "-50", "-25" , "-568"];
    for (index = 0, len = array.length; index < len; ++index) {
      let res = Math.abs(array[index]);
      return res;
    }

}

Answer 1

You approach does not work in this line and the next

let res = Math.abs(array[index]);
return res;

because you need to assign the absolute value to the array or a new array at the same index, like

resultArray[i] = Math.abs(array[index]);

and return the array after finishing the loop.

The original return inside of the loop exits the loop with the first element.

---

Instead, you could take Math.abs as callback for Array#map.

const absoluteValueArray = (array) => {
    return array.map(Math.abs);
}

console.log(absoluteValueArray([-5, -50, -25, -568]));