reversestring.js

function reverseString(str) {
    // base case: when there's no string to reverse
    if (str === '') {
        return ''
    } else {
    // recursive case: 
    // (1) grab the last character of current string, 
    // (2) call the same function 
    // (3) pass in a substring that does NOT include the last character
    // (4) return (1) + (2)
        return str[str.length - 1] + reverseString(str.substring(0, str.length - 1))
    }
}