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uniq

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uniq

Removes duplicates from a sorted array in place


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Package description

What is uniq?

The uniq npm package is primarily used for removing duplicate elements from an array. It provides a straightforward and efficient way to ensure that an array contains only unique values. This can be particularly useful in data processing and manipulation tasks where eliminating duplicates is necessary.

What are uniq's main functionalities?

Removing duplicates from an array

This feature allows you to pass an array to the uniq function, and it returns a new array with all the duplicate values removed. The code sample demonstrates how to use the uniq package to filter out duplicate numbers from an array, resulting in an array of unique numbers.

[...new Set([1, 2, 2, 3, 4, 4, 5])] // Returns [1, 2, 3, 4, 5]

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Source

uniq

Removes all duplicates from an array in place.

Usage

First install using npm:

npm install uniq

Then use it as follows:


var arr = [1, 1, 2, 2, 3, 5]

require("uniq")(arr)
console.log(arr)

//Prints:
//
//  1,2,3,5
//

require("uniq")(array[, compare, sorted])

Removes all duplicates from a sorted array in place.

  • array is the array to remove items from
  • compare is an optional comparison function that returns 0 when two items are equal, and something non-zero when they are different. If unspecified, then the default equals will be used.
  • sorted if true, then assume array is already sorted

Returns: A reference to array

Time Complexity: O(array.length * log(arra.length)) or O(array.length) if sorted

Why use this instead of underscore.uniq[ue]?

A few reasons:

  • This library updates the array in place without making an extra copy (and so it is faster for large arrays)
  • It also accepts a custom comparison function so you can remove duplicates from arrays containing object
  • It is more modular in the sense that it doesn't come with a bazillion other utility grab bag functions.

Credits

(c) 2013 Mikola Lysenko. MIT License

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Last updated on 25 May 2014

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