Summarize array of objects and calculate average value for each unique object name

Question

I have an array like so:

var array = [
     {
       name: \"a\",
       value: 1 
     },
     {
       name: \"a\",
       value: 2 
     },
     {
                


        

Answer 1

Here is a ES2015 version, using reduce

 let arr = [
  { a: 1, b: 1 },
  { a: 2, b: 3 },
  { a: 6, b: 4 },
  { a: 2, b: 1 },
  { a: 8, b: 2 },
  { a: 0, b: 2 },
  { a: 4, b: 3 }
]

arr.reduce((a, b, index, self) => {
 const keys = Object.keys(a)
 let c = {} 

 keys.map((key) => {
  c[key] = a[key] + b[key]

  if (index + 1 === self.length) {
    c[key] = c[key] / self.length
  }
 })

 return c
})