I am curious, in this code: `fun String.asIndex():...

# getting-started

[Rick Pendrick]

I am curious, in this code: fun String.asIndex(): Int = withIndex().sumBy { ... } Why does the call to withIndex() not need use "it" or "this" ? <<I am newbie, obviously!>>

[marstran]

Because this is implicit. You are in the context of a String inside the body of an extension function on String.

[marstran]

So it's equivalent to fun String.asIndex(): Int = this.withIndex().sumBy { ... }, but you just don't have to write this.

[Rick Pendrick]

Thank you. It took me a bit to figure it was implied, as a new person I was just reading open source code.