Kotlin Programming Cookbook

How to do it…

In the given steps, we will learn how to use BufferedReader to read a file line by line:

1. Let's start with getting the InputStream of our file and use the BufferedReader on it to read the contents of the file line by line:

import java.io.Fileimport java.io.InputStreamfun main(args: Array<String>) {    val listOfLines = mutableListOf<String>()    val inputStream: InputStream = File("lorem.txt").inputStream()    inputStream.bufferedReader().useLines {        lines -> lines.forEach {            var x = "# (" + it.length + ") " + it.substring(0,8);            listOfLines.add(x)        }    }    listOfLines.forEach{println(it)}}

The output, in this case, is as follows:

# (56) Lorem ip# (65) Nunc con# (64) Proin he# (84) Proin ut# (47) Sed tinc# (81) Integer# (71) Curabitu# (24) ...