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Node.JS Help SheetNode.JS Help Sheet

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Getting Started

Getting Started

Node.JS is evented I/O for V8 JavaScript. It is asynchronous in nature, with handlers to I/O and other events being function callbacks. It is particularly suited to distributed computing environments with high concurrency.

Modules (continued)

Modules (continued)

util util.log(message) util.debug(message)

Print timestamped message to stdout

Synchronous console.error(message)

Useful methods:

events net event emitter.once(event, listener) emitter.on(event, listener)

Fire listener once

emitter.removeListener(event,listener)Remove a listener emitter.removeAllListeners(event)Remove all listeners emitter.emit(event, [[arg1], [arg2], [...]]) Execute listeners for this event with supplied args

Add a listener for event

Callback functions executed when events occur are listeners. emitter is an instance of EventEmitter. net.Server: net.Socket:

Emitted when:

net.createServer([options], [connectionListener]) Create TCP server.

Returns net.Server

server.listen(port, [host], [callback]) Bind on host:port. listener is executed when bound server.listenFD(fd) Listen on ?le descriptor fd socket.connect(port, [host], [callback]) Open connection to socket socket.bu erSize Number of characters in internal write bu?er socket.write(data, [encoding], [callback]) Send data on socket socket.end() Send FIN packet connect Socket connection established dataData is received endOther end of socket sent FIN packet timeoutTimed out from inactivity drainWrite bu?er has become empty errorError has occurred. close event emitted after closeSocket fully closed socket.pause() Pause reading of data new net.Socket([{fd: le descriptor, type: socket type, allowHalfOpen: bool}])

Construct new socket object

server.close() Stop accepting new connections Asynchronous network wrapper for creating streams.

Globals

Globals

var variable processProperties & methods for current process

Initialize variable local to module

consoleUsed to print to stdout & stderr require()To require modules require.resolveLookup location of module require.pathsPaths to search when requiring modules _ lenameFile name of script being executed _dirnameDirectory name of script being executed moduleReference to current module setTimeout(), clearTimeout() setInterval(), clearInterval()

Modules

Modules

stdio

Process

console.log(string) Print to stdout with newline Object for printing to stdout and stderr, like in a browser. process.on(SIGNAL, callback)Signal events emitted when process receives a signal exitProcess is about to exit Exception bubbled back to event loopuncaughtException process.stdout processs.stderr process.stdin process.argv process.env process.pid

Global object. Instance of EventEmitter

Events:

Properties:

console.error(string) Same as console.log() but to stderr console.time(label) Set time marker console.timeEnd(label) Finish timer, record output console.trace() Print stack trace to stderr of current position node script.jsRun script npm install Install package with npm

Learn more about Node.JS http://nodejs.org/

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