Amazon number of items in container

numberOfItems.js

function numberOfItems(s, startIndices, endIndices) {
    // Write your code here
    let result = [];
    const countArr = {}
    let count = 0
    for(let i = s.indexOf("|"); i< s.length; i++) {
        if(s[i] === "|") {
            countArr[i] = count;
        } else {
            count++;
        }
    }
    for(let i = 0; i < startIndices.length; i++) {
        let start = startIndices[i] - 1;
        let end = endIndices[i] - 1;
        while (s[start] !== '|') start++;
        while (s[end] !== '|') end--;
        console.log(start ,end);
       result[i] =  start < end ? countArr[end] - countArr[start] : 0
    }
    return result;
}