Groups an array/object by property values or callback and supports additional metadata
Works like nest-by, but allows you to embed more metadata. Also see group-by or lodash.groupBy.
nestByTuple(object or array, property, [...properties])property is typically a function that returns an array in the structure of:
[ indexString, metadata ]
Where indexString is a string that the group will be indexed by, and
metadata will be an Object that has data about that group.
genders = { m: 'Male', f: 'Female' }
list =
[ { name: 'Marge', gender: 'f' },
{ name: 'Homer', gender: 'm' },
{ name: 'Bart', gender: 'm' } ]
result = nestByTuple(list,
(person) => [ person.gender, { genderName: genders[person.gender] } ])
// f:
// genderName: 'Famale',
// values: [ { name: 'Marge', gender: 'f' } ]
// m:
// genderName: 'Male',
// values: [
// { name: 'Homer', gender: 'm' },
// { name: 'Bart', gender: 'm' } ]list =
{ marge: { name: 'Marge', gender: 'f' },
homer: { name: 'Homer', gender: 'm' },
bart: { name: 'Bart', gender: 'm' } }
var result = nestBy(list,
(person) => [ person.gender, { genderName: genders[person.gender] } ])
// f:
// genderName: 'Famale',
// values:
// marge: { name: 'Marge', gender: 'f' }
// m:
// genderName: 'Male',
// values:
// homer: { name: 'Homer', gender: 'm' }
// bart: { name: 'Bart', gender: 'm' }Yes, recursion is supported by passing in more property parameters.
nest-by-tuple © 2015+, Rico Sta. Cruz. Released under the MIT License.
Authored and maintained by Rico Sta. Cruz with help from contributors (list).
ricostacruz.com · GitHub @rstacruz · Twitter @rstacruz
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