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title: Context managers and transactions -layout: nuggets.html.pug -category: Advanced examples -level: 2

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date: 2007-01-05

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Context managers are a useful tool. They automatically dispose of resources +Context managers and transactions

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↩Context managers and transactions

Context managers are a useful tool. They automatically dispose of resources when the operation within the context completes or an error happens in that context.

Lets agree that all our disposable resources have a .dispose() method. How @@ -114,3 +108,6 @@

Notes

// all resources are disposed of })

The possibilities are... endless!

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Promise nuggets

Introduction

  1. The simplest example
  2. Creating new functions
  3. Creating new functions
  4. The power of then - sync processing
  5. The power of then - async operations
  6. The first relief - when sync becomes async
  7. Safety of then - thrown errors
  8. Wrapping callback functions

Multiple operations

  1. Doing things in parallel (async.parallel)
  2. Doing things in series (async.waterfall)
  3. Complex task dependencies
  4. Parallel map (async.map)
  5. Series map (async.mapSeries)
  6. Concurrency level (async.mapLimit)

Using deferred

  1. Promise-based timeouts
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