zmts/reduce.md

Last active November 23, 2020 22:25

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Reduce

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Reduce

Objects array to object

const someObjectsArr = [{id: 1, name: 'alex'}, {id: 2, name: 'bob'}]
const objectsById = someObjectsArr.reduce((result, item) => {
  result[item.id] = item
  return result
}, {})

console.log(objectsById) // >>
{
  1: {id: 1, name: 'alex'}
  2: {id: 2, name: 'bob'}
}

Objects array to flat array

const someObjectsArr = [{id: 1, name: 'alex'}, {id: 2, name: 'bob'}]
const flatArray = someObjectsArr.reduce((acc, curr) => acc.concat(...Object.entries(curr)) , [])

console.log(flatArray) // >>
["id", 1, "name", "alex", "id", 2, "name", "bob"]

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