Debounce based on a hashing function

This is basically underscore's debounce with an additional hashing function.

Example:

function ping(user) {
  user.ping()
}

// You want to debounce these pings at a 100ms interval,
// but on a per user basis

var debounceHashed = require('debounce-hashed')

var pingDebounced = debounceHashed(ping, function hashingFn(user) {
  return user.id
}, 100)

// Or if you ping only by userid

var pingDebounced2 = debounceHashed(function pingById(userid) {
  user.getById(userid, function (err, user) {
    if (!err && user) user.ping();
  })
}, function hashingFn(userid) {
  return userid
}, 100)

debounceHashed(fn, hashingfn, wait, [options])

• fn - the function to be debounced
• hashingFn - hashing function. Receives the same arguments as fn. Should return a string.
• wait - Time (in milliseconds) to wait before calling the function
• options.immediate - boolean - default: false - If true the function is called immediately, then not called again if it's called within wait ms.
• options.maxWait - Max time to wait (in milliseconds) before calling the function, even if the debounced function is called repeatadly in < wait ms.

License

The MIT License (MIT)

Copyright (c) 2013 Jonathan Ong [email protected]

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.