Pivot or Transforming JavaScript object

Question

I have the following JavaScript object. I need to generate a new object from the given object. What is the approach I should take in JavaScript?

[
 {\"name\"         


        

Answer 1

I don't know why you want the .count property, when that can be accessed via the array's .length property, but anyway:

const input = [
  {"name": "Dan",  "city" : "Columbus", "ZIP":"47201"},
  {"name": "Jen",  "city" : "Columbus", "ZIP":"47201"},
  {"name": "Mark", "city" : "Tampa",  "ZIP":"33602"},
]

const working = input.reduce((acc, {ZIP, name, city}) => {
  (acc[ZIP] || (acc[ZIP] = [])).push({name, city})
  return acc
}, {})

const output = Object.keys(working)
  .map(k => ({[k]: working[k], count: working[k].length}))

console.log(output)

Further reading:

• Array .reduce()
• Array .map()
• Object.keys()
• Unpacking fields from objects passed as function parameters
• Computed property names