Example App in Node.js

Sample Application

Now that you understand the core concepts of Node.js let’s now create a simple application and execute it with Node.js with the terminal.

[code lang=text]
touch app.js
echo "console.log('(7 + 5) / 2 is ?', (7+5)/2)" >> app.js
node app.js
[/code]

Results

[code lang=text]
(7 + 5) / 2 is ? 6
[/code]

Working with REPL

[code lang=bash]
node
[/code]

node opens the interactive shell (also called REPL) a perfect
place to test simple one liners in JavaScript, to get out of it simply press Ctrl + C twice.

[code lang=text]
node

console.log('(7 + 5) / 2 is ?', (7+5)/2);
[/code]

Prints to the console and evaluates the expression

Results

[code lang=text]
(7 + 5) / 2 is ? 6
[/code]

Give some of the following commands a try with node.

OPTIONS

[code lang=bash]
-v, –version print nodes version
-e, –eval script evaluate script
-p, –print print result of –eval
-i, –interactive always enter the REPL even if stdin does not appear to be a terminal
–no-deprecation silence deprecation warnings
–trace-deprecation show stack traces on deprecations
–throw-deprecation throw errors on deprecations
–v8-options print v8 command line options
–max-stack-size=val set max v8 stack size (bytes
–enable-ssl2 enable ssl2 in crypto and https modules
–enable-ssl3 enable ssl3 in crypto and https modules
[/code]

You can find the above material plus all of the V8 OPTIONS that are available on github or if you are on a *nix system just use the man pages.

[code lang=bash]
man node
[/code]