In every NodeJS program, there is a magic array named
It contains the command line arguments to the program.
If the user types this in the Terminal:
node hello.js Alice Bob
[ '/usr/local/bin/node', '/Users/alex/code/hello.js', 'Alice', 'Bob' ]
ARGV is a historical name. It means "Argument Vector" and has been around since the early 1970s.
LAB: Command-Line Hello
Write a new program called
hi.js that contains:
console.log("Hi, " + process.argv + "!")
and run it a few times from the Terminal, e.g.
node hi Alice node hi Bob node hi "good buddy"
LAB: Hi, Everybody!
hi.js to say hi to every one of its command line arguments.
node hi Alice Bob Charlie Hi, Alice! Hi, Bob! Hi, Charlie!
Write a program named
add.js that adds all of its command line arguments together.
node add 1 2 3 4 10
Hint: Do you remember how to convert a string to a number?