changing inner array object value with outer array value with map

Question

I'm new to full-stack development, specifically to java-script and functional programming. Using high-order function (like map, filter and so) I need to change inner object array values into the outer array given value:

let arr = [
[ [ 
  {name: "Alice", age: 22},
  {name: "Charlie", age: 35}
 ], "Bob" ],
 [ [
  {name: "John" , age: 42}
  ], "Ben"]
]

and I need output array of:

output = [
 [ 
  {name: "Bob", age: 22},
  {name: "Bob", age: 35}
 ],
 [ 
  {name: "Ben", age: 42}
 ]
]

Thank you.

Simon Crane · Accepted Answer · 2020-02-17 12:58:38Z

2

You already knew to use map, so here it is:

arr.map(x => x[0].map(y => {return {...y, name: x[1]}}))

For each item of the main list, we map it to a list of objects with the name replaced.

answered Feb 17, 2020 at 12:58

Simon Crane

2,1822 gold badges13 silver badges22 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Serghei Tibulschii · Accepted Answer · 2020-02-17 13:58:48Z

0

Slightly modified Simon's answer. Added a little bit of destructuring sugar

let arr = [
[ [ 
  {name: "Alice", age: 22},
  {name: "Charlie", age: 35}
 ], "Bob" ],
 [ [
  {name: "John" , age: 42}
  ], "Ben"]
]

const result = arr.map(([data, name]) => data.map(({age}) => ({name, age})))

console.log(result)

answered Feb 17, 2020 at 13:58

Serghei Tibulschii

172 bronze badges

Collectives™ on Stack Overflow

changing inner array object value with outer array value with map

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related