Find the Slope JavaScript

I have a codewars problem below:

Given an array of 4 integers [a,b,c,d] representing two points (a, b) and (c, d), return a string representation of the slope of the line joining these two points.
For an undefined slope (division by 0), return undefined . Note that the "undefined" is case-sensitive.
a:x1 b:y1 c:x2 d:y2
Assume that [a,b,c,d] and the answer are all integers (no floating numbers!). Slope: https://en.wikipedia.org/wiki/Slope*

I can get the slope for any numbers when 0 is not in the denominator (bottom of the fraction). However, whenever 0 is in the denominator, I get this message:

*expected undefined to equal '0'

I'm not sure on how to solve this part. My code so far is below:

function slope(points) {
  let a = (points[0]);
  let b = (points[1]);
  let c = (points[2]);
  let d = (points[3]);
  function findSlope(a,b,c,d) {
    if (c-a === 0) {
      return 'undefined';
    }
    else if (c-a !== 0) {
      let slope = (d-b)/(c-a);
      let answer = slope.toString();
      return answer;
    }
    else {
      return 'undefined';
    }
  }
}

Thank you!

Via Active questions tagged javascript - Stack Overflow https://ift.tt/1BLizxI

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