nodejs: shore alias for process.stdout.write

I'm learning nodejs(and I like it!). I tried to figure out how to have shorter alias for console.log and I found out that I can use var cout=console.log and use cout('[string]') from then on. Then when I wanted to use process.stdout.write and I tried to make a short alias for it too, using var out=process.stdout.write. But when I use out('[string]'), I get the following error:

_stream_writable.js:220   var state = this._writableState;                   ^   TypeError: Cannot read property '_writableState' of undefined

    at Writable.write (_stream_writable.js:220:19)     at Socket.write (net.js:670:40)     at Object. (/home/shayan/Desktop/nodejs/server.js:12:1)

    at Module._compile (module.js:571:32)

    at Object.Module._extensions..js (module.js:580:10)     at Module.load (module.js:488:32)     at tryModuleLoad (module.js:447:12)     at Function.Module._load (module.js:439:3)     at Module.runMain (module.js:605:10)     at run (bootstrap_node.js:423:7)

What is wrong here? How can I correctly create a short alias for process.stdout.write? Thanks

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