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lodash.groupby

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lodash.groupby

The lodash method `_.groupBy` exported as a module.

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What is lodash.groupby?

The lodash.groupby npm package is a utility that allows for the grouping of collection items based on a specified criterion. This can be particularly useful for organizing data, performing aggregations, or simplifying complex collections of objects or arrays by categorizing them into groups.

What are lodash.groupby's main functionalities?

Grouping by property

This feature allows grouping of objects in an array by a specific property. In the provided code, objects are grouped by their 'age' property.

_.groupBy([{ 'age': 23 }, { 'age': 24 }], 'age')

Grouping by computed criterion

This demonstrates grouping elements of an array by a computed criterion, in this case, rounding down the numbers to the nearest whole number using Math.floor.

_.groupBy([6.1, 4.2, 6.3], Math.floor)

Grouping by property path

This feature allows for grouping by nested object properties, specified by a path. Here, objects are grouped based on the 'age' property nested under 'user'.

_.groupBy([{ 'user': { 'age': 23 } }, { 'user': { 'age': 24 } }], 'user.age')

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Package last updated on 13 Aug 2016

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