Exercises

• 4.1 File concatenation: Write the implementation of concatFiles(), a callback-style function that takes two or more paths to text files in the filesystem and a destination file:

  function concatFiles (srcFile1, srcFile2, srcFile3, ... ,
                        dest, cb) {
    // ...
  }
  

  This function must copy the contents of every source file into the destination file, respecting the order of the files, as provided by the arguments list. For instance, given two files, if the first file contains foo and the second file contains bar, the function should write foobar (and not barfoo) in the destination file. Note that the preceding example signature is not valid JavaScript syntax: you need to find a different way to handle an arbitrary number of arguments. For instance, you could use the rest parameters syntax (nodejsdp.link/rest-parameters).

• 4.2 List files recursively: Write listNestedFiles(), a callback-style function that takes, as the input...