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Published: May 20, 2018 License: MIT Imports: 0 Imported by: 8


Go Type-Agnostic Collection Partitioning

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Type-agnostic partitioning for anything that can be indexed in Go - slices, arrays,strings. Inspired by Guava's Lists.partition. This tiny library alleviates the issue of partitioning collections with wide ranging types - Go lacks generics - by returning consecutive index ranges that can be used on any indexable object.


    // bigList can be any type
    for idxRange := range gopart.Partition(len(bigList), partitionSize) {

Full Executable Example


# install the library:
go get

// use in your .go code:
import (


The partitioning is done with a separate goroutine that passes the index ranges to a channel. This requires the use of a for...range loop, but adds concurrency and lowers memory usage (no slice of index ranges is stored anywhere).



The gopart package alleviates the issue of partitioning collections with wide-ranging types by returning index ranges that can be used on any indexable object. Inspired by Guava's Lists.partition



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func Partition

func Partition(collectionLen, partitionSize int) chan IdxRange

Partition enables type-agnostic partitioning of anything indexable by specifying the length and the desired partition size of the indexable object. Consecutive index ranges are sent to the channel, each of which is the same size. The final range may be smaller than the others.

For example, a collection with length 8 and partition size 3 yields ranges: {0, 3}, {3, 6}, {6, 8}

This method should be used in a for...range loop. No results will be returned if the partition size is nonpositive. If the partition size is greater than the collection length, the range returned includes the entire collection.


type IdxRange

type IdxRange struct {
	Low, High int

IdxRange specifies a single range. Low and High are the indexes in the larger collection at which this range begins and ends, respectively. Note that High is exclusive, whereas Low is inclusive.

Source Files

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