Distinct value

As explained in The Well-Grounded Rubyist, Fourth Edition

uniq is a Ruby Array method that returns a new array with duplicate elements removed according to equality comparison.

>> [1,2,3,1,4,3,5,1].uniq
=> [1, 2, 3, 4, 5]

How The Well-Grounded Rubyist, Fourth Edition covers it

How deep it goes

Defines duplicates through pairwise == tests and notes uniq! as the in-place counterpart.

Examples

Demonstrates removing repeated integers from an array, yielding [1, 2, 3, 4, 5].

What you can do after

Apply Array#uniq to return a deduplicated array, or use uniq! to remove duplicates from the original.

How it connects

Ties array transformation to Ruby's == equality comparison.

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Also explained in

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  Starting Data Analytics with Generative AI and PythonA unique value is a distinct value occurring in a field or variable, counted once regardless of its frequency.
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  Statistics Slam DunkThe unique() function in R returns the distinct elements, rows, or combinations of values in an object.

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Related concepts

• setaddressed by · A set is a collection of unique elements in which membership is determined by whether an element is present, not by duplicate occurrences.
• data frameused by · A data frame is a two-dimensional tabular data structure with labeled rows and columns that can contain values of different types.
• NumPyused by · NumPy is an open-source Python library for numerical computing that provides multidimensional arrays and operations on them.
• scopeconfigured by · Scope is a defined boundary specifying which entities, activities, resources, or conditions are included or governed in a particular context.
• comprehensionproduced by · A comprehension is a language construct that creates a collection by iterating over one or more sources, optionally filtering elements and transforming them.
• dropdownused by · A dropdown is a user-interface control that presents a set of choices for user selection, often revealing them when activated.

This explainer was generated by Manning's knowledge graph from the text of The Well-Grounded Rubyist, Fourth Edition. The section links point to the parts of the book it draws on.