Higher-order Functions (part-I)

This is where it gets really interesting, and Kotlin’s efficiency is at full display.

If we look at our earlier example, the val keyword is followed by a variable name, strings. Therefore, we’re basically dealing with a variable declaration, which is then defined by the = and the code that follows.

Recall that strings is a list of objects of the String type:

var lengths = strings.map {it.length}

Now, we call a method named map on it, but that looks a bit strange for Java eyes. You might also think we mistyped curly braces for parentheses. However, what looks like a typo is a very common and extremely elegant Kotlin idiom. However, to ...