leetcode-472.js

var findAllConcatenatedWordsInADict = function(words) {
    const result = []
    for (let i=0; i < words.length; i++) {
        if (findWord(i, words[i], words)) {
            result.push(words[i])
        }
    }
    return result
};

function findWord(idx, word, words) {
    if (word.length === 0) return true

    for (let i=0; i < words.length; i++) {
        if (idx !== i && word.startsWith(words[i])) {
            const substr = word.substring(words[i].length)
            if (findWord(idx, substr, words)) {
                return true
            }
        }
    }

    return false
}