Function getLength

javascript/0005-longest-palindromic-substring.js:37–50

(s, left, right)

};

const getLength = (s, left, right) => {
    const canExpand = () => 0 <= left && right < s.length;
    const isSame = () => s[left] === s[right];

    const isPalindrome = () => canExpand() && isSame();
    while (isPalindrome()) {
        left--;
        right++;
    } /* Time O(N) */

    const window = right - left - 1;

    return window;
};