Count my attempts
IntuitionApproachComplexity
Time complexity:

Space complexity:
Code
# Intuition
<!-- Describe your first thoughts on how to solve this problem. -->

# Approach
<!-- Describe your approach to solving the problem. -->

# Complexity
- Time complexity:
<!-- Add your time complexity here, e.g. $$O(n)$$ -->

- Space complexity:
<!-- Add your space complexity here, e.g. $$O(n)$$ -->

# Code
```javascript []
/**
 * @param {Array<Function>} functions
 * @return {Promise<any>}
 */
var promiseAll = function (functions) {

    return new Promise(async (resolve, reject) => {
        let promises = [];
        let counter = 0;

        for (const key of functions.keys()) {
            functions[key]()
                .then((result) => {
                    promises[key] = result;
                    counter++;
                    if (counter == functions.length) {
                        resolve(promises);
                    }
                })
                .catch((err) => {
                    reject(err);
                });
        };
    });

};

/**
 * const promise = promiseAll([() => new Promise(res => res(42))])
 * promise.then(console.log); // [42]
 */
```
['JavaScript']