Finding letter distance in strings - JavaScript

We are required to write a JavaScript function that takes in a string as first argument and two single element strings. The function should return the distance between those single letter stings in the string taken as first argument.

For example −

If the three strings are −

const str = 'Disaster management'; const a = 'i', b = 't';

Then the output should be 4 because the distance between 'i' and 't' is 4

Example

Following is the code −

const str = 'Disaster management'; const a = 'i', b = 't'; const distanceBetween = (str, a, b) => {    const aIndex = str.indexOf(a);    const bIndex = str.indexOf(b);    if(aIndex === -1 || b === -1){       return false;    };    return Math.abs(aIndex - bIndex); }; console.log(distanceBetween(str, a, b));

Output

Following is the output in the console −

4