In node.js you can use console.log or sys.puts to print out to the screen.
What is the preferred method and what is the difference between these?
Add a comment
|
7 Answers
sys.puts simply prints the given string in the logs.
But if you want to print a more complex object (Array, JSON, JSObject) you have to use console.log because you want to "look inside" of the object.
sys.puts would give you only "[object object]" for example.
1 Comment
fullstacklife
yes, however you don't HAVE to use console logs to see the object. sys.puts("check out this funky object in detail: " + sys.inspect(yourobject));
Both just write to the stdout stream. The difference is that sys.puts just toString's the first argument, and console.log takes multiple arguments, and will sys.inspect the first arg if it's not a string.
2 Comments
700 Software
sys.inspect is now util.inspect
Mikhail.Mamaev
Actually console is used to print to stdout and stderr streams.
Puts is deprecated in since version 0.2.3
3 Comments
700 Software
Please cite the source by linking to where you found the information.
xer0x
Speaking of deprecation, it looks like the 'sys' module has become the 'util' module. The puts() method is still around, but the utils.p() prints a deprecated warning.
Amol M Kulkarni
@xer0x : 'sys' module was renamed to be 'util'. It was a Fix on require('sys') #3577
Also you can use console.log without requiring the sys module.
Comments
console.dir(objectToInspect)
This might be another way to inspect objects.
answered Oct 10, 2011 at 7:52
Rajkamal Subramanian
6,9646 gold badges56 silver badges71 bronze badges
Comments
sys.puts([...]);
Is a synchronous output function. Simply it is a blocking function as in Node.js language.
console.log([data], [...]);
Prints to stdout with newline.
For more Info:
http://nodejs.org/api/stdio.html#stdio_console_log_data
http://nodejs.org/api/util.html#util_util_puts
Note: 'sys' module was renamed to be 'util' (Supported by link) It was a Fix #3577
Comments
The preferred method is console.log(). sys.puts() has been removed.
The sys module was renamed util with this commit dated Oct 12, 2010. So sys.puts() became util.puts(). util.puts() was added in v0.3.0, deprecation since v0.11.3, and removed in v12.0.0. The documentation advises to use console.log() instead.
