Learn the process of extracting an array of objects by utilizing an interface

Question

Learn the process of extracting an array of objects by utilizing an interface

Working with an array of objects containing a large amount of data can be challenging. Here's an example dataset with multiple key-value pairs:

 [{ "id": 1, "name":"name1", age: 11,   "skl": {"name": "KK school"} },
    { "id":2, "name":"name2", age: 12, "skl": {"name": "KK school"} },
    { "id":3, "name":"name3", age: 13, "skl": {"name": "KK school"} },
    { "id":4, "name":"name4", age: 14, "skl": {"name": "KK school"} } ]

If you only need to extract the id, name, and skl name from the array, you can reformat it as follows:

 [  { "id": 1, "name":"name1", "skl": {"name": "KK school"}},
    { "id": 2, "name":"name2", "skl": {"name": "KK school"}},
    { "id": 3, "name":"name3", "skl": {"name": "KK school"}},
    { "id": 4, "name":"name4", "skl": {"name": "KK school"}} ]

Are there any techniques or solutions for efficiently extracting specific data from such arrays of objects?

javascript angular typescript angular9 angular-json

Answer 1

Answer №1

There are two options when working with properties: you can specify the ones to keep or the ones to remove:

const data = [
{ "id": 1, "name":"name1", age: 11, "skl": {"name": "KK school"} },
{ "id": 2, "name":"name2", age: 12, "skl": {"name": "KK school"} },
{ "id": 3, "name":"name3", age: 13, "skl": {"name": "KK school"} },
{ "id": 4, "name":"name4", age: 14, "skl": {"name": "KK school"} } ]

// Select specific properties to keep:
console.log(data.map(({id, name, skl})=>({id, name, skl})))

// Choose properties to drop:
console.log(data.map(({age, ...other})=>other))

// For dynamic selection:
console.log(data.map(i=>Object.fromEntries(Object.entries(i)
  .filter(([k])=>['id','name','skl'].includes(k)))))

Answer 2

There are two options when working with properties: you can specify the ones to keep or the ones to remove:

const data = [
{ "id": 1, "name":"name1", age: 11, "skl": {"name": "KK school"} },
{ "id": 2, "name":"name2", age: 12, "skl": {"name": "KK school"} },
{ "id": 3, "name":"name3", age: 13, "skl": {"name": "KK school"} },
{ "id": 4, "name":"name4", age: 14, "skl": {"name": "KK school"} } ]

// Select specific properties to keep:
console.log(data.map(({id, name, skl})=>({id, name, skl})))

// Choose properties to drop:
console.log(data.map(({age, ...other})=>other))

// For dynamic selection:
console.log(data.map(i=>Object.fromEntries(Object.entries(i)
  .filter(([k])=>['id','name','skl'].includes(k)))))

Answer 3

Answer №2

Loop through an array to extract the age values and return the remaining data without the age key

  data.map(({age,...remaining}) => remaining) // mapping generates a new array

Answer 4

Loop through an array to extract the age values and return the remaining data without the age key

  data.map(({age,...remaining}) => remaining) // mapping generates a new array

Learn the process of extracting an array of objects by utilizing an interface

Answer №1

Answer №2

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