Find Repeating

Create a function that accepts a string and groups repeated values. The groups should have the following structure: [[value, first_index, last_index, times_repeated], ..., [value, first_index, last_index, times_repeated]].

• value: Character being assessed.
• first_index: Index of characters first appearance.
• last_index: Index of characters last appearance.
• times_repeated: Number of consecutive times character repeats.

Examples

findRepeating("a") ➞ [["a", 0, 0, 1]]

findRepeating("aabbb") ➞ [["a", 0, 1, 2], ["b", 2, 4, 3]]

findRepeating("1337") ➞ [["1", 0, 0, 1], ["3", 1, 2, 2], ["7", 3, 3, 1]]

findRepeating("aabbbaabbb") ➞ [["a", 0, 1, 2], ["b", 2, 4, 3], ["a", 5, 6, 2], ["b", 7, 9, 3]]

Notes

• An empty string should return an empty array: "" ➞ []
• Non-repeated values should start and end on the same index.