FnLimit

A bit of code that will limit and iterate a function call.

Install

npm install fnlimit

npm install ben-bradley/fnlimit

Example

Iterating a specified number of times

var fnlimit = require('../');

var i = 0;

fnlimit({
  times: 20,
  limit: 6,
  progress: true, // optional
  callback: function (next) {
    setTimeout(function () {
      next();
    }, 1000);
  },
  done: function (err) {
    console.log('All done!');
  }
});

Iterating a list of items

var fnlimit = require('../');

var i = 0;

fnlimit({
  limit: 3,
  list: [ 1, 2, 3, 4, 5, 6 ],
  progress: true, // optional
  callback: function (item, next) {
    setTimeout(function () {
      console.log(item); // => 1, 2, 3, ...
      next(err, 'a result!');
    }, 1000);
  },
  done: function (err) {
    console.log('All done!');
  }
});

Options

• times - (Number) The number of times that you want to call the callback.
• limit - (Number) The number of callbacks to run at the same time.
• list - (Array) A list of items to provide to the callback. If specified, each item is injected into callback as the first argument and next() becomes the second arg.
• progress - (Boolean|Array, optional) If true, then it will display the default progress bar with each call of next(). Alternatively, you can provide an array of arguments to send to ProgressBar() using

fnlimit({
  times: 20,
  limit: 6,
  // see https://github.com/visionmedia/node-progress#tokens
  progress: [ '[:bar] :percent', { width: 80 } ], // or progress: true,
  callback: function (next) {
    setTimeout(function () {
      next();
    }, 1000);
  },
  done: function (err) {
    console.log('All done!');
  }
});

• callback - (Function) The function to iterate. Provides a next function called within the callback to iterate correctly.
• done - (Function) The function to call when all iterations are complete. Provides an error which is passed through if provided to next.

Versions

• 0.0.4 - Modified next() to accept results and pass them to done()
• 0.0.3 - Added list option to inject an item into callback
• 0.0.2 - Added custom progress bar option
• 0.0.1 - Initial drop