Rescursive string splitting

splitter.js

/* 
Write a recursive function that splits a string based on a separator (similar to String.prototype.split). 
Don't use JS array's split function to solve this problem.

Input: 02/20/2020 
Output: ["02", "20", "2020"]

https://courses.thinkful.com/dsa-v1/checkpoint/2

*/


function splitString(str, sep) {
    const foundIndex = str.indexOf(sep)
    if (foundIndex === -1) {
        return [str]
    }
    const piece = str.substring(0, foundIndex)
    const remaining = str.substring(foundIndex+1)
    console.log(`str: ${str}, index: ${foundIndex}, remaining: ${remaining}`)
    const remainingResult = splitString(remaining, sep)
    // return  [piece].concat(remainingResult)
    return [piece, ...remainingResult]
    
}

const result = splitString('123/45678/abcde', '/')
console.log(`result`, result)