Find value in javascript array of objects deeply nested with ES6

Question

In an array of objects I need to find a value -- where key is activity : However the activity key can be dee

Answer 1

First, your function could be improved by halting once a match is found via the recursive call. Also, you're both declaring match outside, as well as returning it. Probably better to just return.

const findMatchRecursion = (activity, activityItems) => {
    for (let i = 0; i < activityItems.length; i += 1) {
        if (activityItems[i].activity === activity) {
            return true;
        }

        if (activityItems[i].items && findMatchRecursion(activity, activityItems[i].items) {
            return true;
        }
    }

    return false;
};

There's no built in deep search, but you can use .find with a named function if you wish.

var result = !!activityItems.find(function fn(item) {
  return item.activity === "Gym" || (item.items && item.items.find(fn));
});