I was trying to group an array. For convenience I have used an example from the documentation.

### Question:

- Is the sequence returned for each letter ordered guaranteed to be in the same order as the input ?

### Note:

- Based on my testing it seems to be ordered, just wanted to check if it was guaranteed to be ordered as the input.
- Notice the order of
`Kofi`

and`Kweku`

are interchanged in example 2. - Using Swift 4.2, Xcode: Version 10.1 (10B61)

### Example 1:

```
let students = ["Kofi", "Abena", "Efua", "Kweku", "Akosua"]
let studentsByLetter = Dictionary(grouping: students, by: { $0.first! })
print(studentsByLetter)
```

**["K": ["Kofi", "Kweku"], "A": ["Abena", "Akosua"], "E": ["Efua"]]**

### Example 2:

```
let students = ["Kweku", "Abena", "Efua", "Kofi", "Akosua"]
let studentsByLetter = Dictionary(grouping: students, by: { $0.first! })
print(studentsByLetter)
```

**["K": ["Kweku", "Kofi"], "A": ["Abena", "Akosua"], "E": ["Efua"]]**