Underscore.eachN

Underscore plugin for iterating over arrays, n elements at a time.

_.eachN([1, 2, 3, 4, 5, 6, 7, 8], 3, function (slice) { console.log(slice); });
=> prints [1, 2, 3]
=> prints [4, 5, 6]
=> prints [7, 8]
=> [1, 2, 3, 4, 5, 6, 7, 8] (returned for chaining)

_.mapN([1, 2, 3, 4, 5, 6, 7, 8], 3, function (slice) { return _.max(slice); });
=> [3, 6, 8]

Installation

Install Underscore.eachN by running:

bower install Underscore.eachN
npm install underscore.eachn

Documentation

In CommonJS:

var _ = require('underscore');
 
_.eachn = require('underscore.eachn');
_.mixin(_.eachn.exports());

_.eachN(obj, n, iterator, context)

Iterates over a list of elements by slicing the it, n at a time, yielding those n items to an iterator function. The iterator is bound to the context object, if one is passed. Each invocation of iterator is called with three arguments: (slice, firstIndex, list), where firstIndex is the index of the beginning of the slice. If elements.length it not divisible by n, the last invocation to iterator will have fewer than n elements. Returns the original list for chaining.

_.mapN(obj, n, iterator, context)

Produces a new array of values by slicing list, n at a time, and mapping each slice through a transformation function (iterator).

Contribute

• Issue Tracker: github.com/bodylabs/Underscore.eachN/issues
• Source Code: github.com/bodylabs/Underscore.eachN

License

The project is licensed under the two-clause BSD license.