TemperTemper

Index By Property

Create an object indexed by a property value for fast lookups.

Code

General
arr.each_with_object({}) { |item, h| h[item[key].to_s] = item }

Parameters

Array of objects

Property to index by

Server

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Array Difference

Find elements in the first array that are not present in the second array.

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Count how many times each value appears in an array and return a frequency map.

Array Head

Get the first n elements of an array.

Array Intersection

Find common elements that exist in both arrays.

Array Tail

Get the last n elements of an array.

Array Union

Combine two arrays and remove duplicates to produce a union.