Get ids from array of objects

Question

I am new to Typescript. I want to select ids from observable I have an array as below. Please help me to get the expected output.

const Input=[{
  "id": 1,
  "text": "My Choice 1"
}, {
  "id": 2,
  "text": "My Choice 2"
}, {
  "id": 3,
  "text": "My Choice 3"
}, {
  "id": 4,
  "text": "My Choice 4"
}, {
  "id": 5,
  "text": "My Choice 5"
}];

Expected Result :

let selectedIds = [
      {id: "Choice", name: "2"},
      {id: "Choice", name: "3"},
      {id: "Choice", name: "5"}];

Could you explain the relation between your Input and Output ? Are you filtering ? based on what criteria ? How do you transform your Input ? — jo_va
– jo_va, Commented Apr 16, 2019 at 10:36
id's should be unique, why are you keeping same id for every object ? — Code Maniac
– Code Maniac, Commented Apr 16, 2019 at 10:39

Sajeetharan · Accepted Answer · 2019-04-16 07:26:52Z

3

Use array.map to transform the objects

 const Input=[{
  "id": 1,
  "text": "My Choice 1"
}, {
  "id": 2,
  "text": "My Choice 2"
}, {
  "id": 3,
  "text": "My Choice 3"
}, {
  "id": 4,
  "text": "My Choice 4"
}, {
  "id": 5,
  "text": "My Choice 5"
}];

let Result = Input.map(choice => ({ id: "choice", name: choice.id }));
console.log(Result);

answered Apr 16, 2019 at 7:26

Sajeetharan

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2 Comments

minnu merin alex Over a year ago

I want to send this result as a string to pass it as a variable in a query. let res = this.apollo.use('dataInsert').mutate({ mutation: researchCreate, variables: { result: Result } }); where "result" accepts string.How will i pass the avove Result as string.

orimdominic Over a year ago

Use const myString = Json.stringify(Result);. Json.stringify(jsonData) converts Json data to a string and returns it

Just Shadow · Accepted Answer · 2019-04-16 07:28:03Z

2

let selectedIds = Input.map(item => 
{
  return {
    id: item.text,
    name: item.id
  };
})

answered Apr 16, 2019 at 7:28

Just Shadow

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