This lab can write to a single file, and retrives data from single or multiple files using either callbacks or promises.

From the command line, type node edit-file.js ./files/test.txt and press Enter.

In index.js, there are four declarations for which type of file reader to use. Uncomment the one to be ran. Available readers:

reader.js - Read 3 files with callbacks. reader-callbacks-extended.js - Read any number of files with callbacks. reader-promises.js - Read 3 files with promises. reader-promises-all.js - Read and number of files with promises.

From the command line, type node index.js ./files/1.txt ./files/2.txt ./files/3.txt. Include as many or as few files as desired.