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kotlinlang

Hi guys, I'm a newcomer to kotlin and I've been working through the Kotlin in Action book. I'm currently on chapter 6.3.5 and I don't quite get this snippet:
```&gt;&gt;&gt; val letters = Array(26) { i -&gt; ('a' + i).toString() }
&gt;&gt;&gt; println(letters.joinToString(""))
abcdefghijklmnopqrstuvwxyz
```
What exactly is `'a' + i`? I've done a little bit of testing and depending on `i` it will return a character. For example:
```println('a' + 2) 
c
```
It seems very basic but I can't find any more detail explanation for this.

It means `'a'.plus(2)`, ie calling into this function: <https://kotlinlang.org/api/latest/jvm/stdlib/kotlin/-char/plus.html>

you’ll read more about operator functions later in the book

Yeah I found the `operator` function in Char.kt. It a little bit confusing at first since there's no implementation detail.

```
/** Adds the other Int value to this value resulting a Char. */
    public operator fun plus(other: Int): Char
```

yeah I guess it’s worded a little weirdly, but it’s doing essentially what you’d expect. It takes the index associated with the `char` (ie the ascii value), adds the other `int` to it, and returns the `char` associated with that index.