ES2015

Note: Most of these examples were taken from http://node.green

Default Parameters

function test(a, b = '1') {
  console.log(a, b)
}
 
test(1, 2) // '1 2' 
test(2)    // '2 1'

function test(a, ...args) {
  console.log(a, args)
}
 
test(1, 2, 3, 4, 5) // '1 [ 2, 3, 4, 5 ]'

const { c, x:d } = { c: 6, d: 8 }
 
console.log(c) // 6 
console.log(d) // 8

buffer: Deprecated new Buffer() in favor of Buffer.from(), Buffer.alloc() and Buffer.allocUnsafe()
cluster: Worker#suicide has been deprecated in favor of the more descriptive Worker#exitedAfterDisconnect
freelist: Has been removed (Intended to be internal only)
path: All methods now throw if the provided input is not a string
process: process.EventEmitter is now deprecated and will be removed in v7
querystring: The object returned from querystring.parse() no longer inherits from Object.prototype
url: url.resolve() now drops auth info if host changes

LTS Status	Release	LTS Start	Maintenance Start	LTS End
Maintenance	v0.10	-	2015-10-01	2016-10-01
Maintenance	v0.12	-	2016-04-01	2016-12-31
Active	v4	2015-10-01	2017-04-01	2018-04-01
N/A	v5	N/A
Pending	v6	2016-10-01	2018-04-01	2019-04-01

Missing or truncated error message #6867
- In some cases, if an error is thrown, it is possible for part of the message to not make it to the console.
stdio buffered writes (chunked) issues & process.exit() truncation #6456
- Explicitly calling process.exit() can prevent stdout/stderr from being flushed.