Function groupArrayBy

Group an array using a grouping function into an object

Returns

an object containing arrays with an entry for each group

Example

const { odd, even } = groupArrayBy([1, 2, 3, 4], x => x % 2 === 0 ? 'even' : 'odd')
// odd === [1, 3]
// even === [2, 4]

Example

const peopleByAge = groupArrayBy([
 { name: 'John', age: 20 },
 { name: 'Claire', age: 20 },
 { name: 'Ben', age: 23 }
], person => person.age)
peopleByAge === {
 20: [
   { name: 'John', age: 20 },
   { name: 'Claire', age: 20 }
 ],
 23: [
   { name: 'Ben', age: 23 }
 ]
}