Add .take() and .flushStats()

• Add .take(key) method to get and delete a key with a single operation. #159 #160
• Add .flushStats() method to reset all cache stats back to 0. #158 #161

Fix deleteOnExpire: false

• Fixed bug where expired values were deleted even though deleteOnExpire was set to false. Thanks to fielding-wilson for #154!

Fix null values

• Fixed bug where users could not set null values. Thanks to StefanoSega, jwest23 and marudor! #151 #152

Drop lodash dependency and callbacks

• Remove lodash dependency
• DROP CALLBACK SUPPORT - Read the migration guide if you are currently using the callback based api! ⚠️
• add .has(key) and method - Thanks to Regev Brody for PR [#132]!
• add .mset([{key,val,ttl}]) method - Thanks to Sujesh Thekkepatt for PR [#142]!
• add maxKeys setting to limit cache size - Thanks do @daluf for PR [#141]!
• Also, thank you to all other contributors that remain unnamed here! 🎉

---

MIGRATION GUIDE 🚧

We have dropped callback support in node-cache and you should migrate to our sync-style api!

If you cannot refactor right now, you can turn on legacy callback support by enabling the enableLegacyCallbacks option. Eg: const cache = new NodeCache({ enableLegacyCallbacks: true })

But we strongly recommend to refactor your code to use the sync-api because we will drop official callback support in Versions v6.x and onwards.

If your code currently looks like this:

cache.get("my-key", function(err, value) {
  if (err) {
     // ...
  }

  // double equal checks for null and undefined
  if (value != null) {
    // hmm.... nothing here :(
  }

  // do something with value
});

it should be rewritten to:

const value = cache.get("my-key");

// double equal checks for null and undefined
if (value != null) {
  // hmm.... nothing here :(
}

// do something with value

4.2.1: Upgrade lodash to version 4.17.15

• Upgrade lodash to version 4.17.15 to avoid security issues

New Options + Typescript definitions

• Add options.promiseValueSize for promise value. Thanks to Ryan Roemer for the pull [#84]
• Added option deleteOnExpire
• Added DefinitelyTyped Typescript definitions. Thanks to Ulf Seltmann for the pulls [#90] and [#92]
• Thanks to Daniel Jin for the readme fix in pull [#93]
• Optimized test and ci configs.

fix internal check interval

• fix internal check interval for node < 0.10.25, thats the default node for ubuntu 14.04.
  Thanks to Jimmy Hwang for for the pull #78;
• added more docker tests

key validation

• Added tests for different key types
• Added key validation (must be string or number)
• Fixed .del bug where trying to delete a number key resulted in no deletion at all.

Breaking `.ttl` fix & Converted tests to mocha

• Updated tests to mocha
• Fixed .ttl bug to not delete key on .ttl( key, 0 ). This is also relevant if stdTTL=0.
  This causes the breaking change to 4.0.0.

lodash 4.x

• Updated lodash to 4.x.
• optimized grunt
• updated dependencies
• no more compiled code in the repo
• dropped travis test for node 0.6 and 0.8 because of failing grunt build