how to merge or concatenate two list of maps in typescript? [duplicate]

Question

I have 2 list of maps like

payload1 = [
    {
      'series': 'abc',
      'value' : 123,
      'date'  : '2020-06-22'
    }, { 
      'series': 'efg',
      'value' : 789,
      'date'  : '2020-06-21'
    } ]

and

    payload2 = [
    {
      'series': 'xyz',
      'value' : 234,
      'date'  : '2020-06-22'
    }, { 
      'series': 'tuv',
      'value' : 23442,
      'date'  : '2020-06-21'
    } ]

How can I genrate a new list of map like

  payload = [
    {
      'series': 'abc',
      'value' : 123,
      'date'  : '2020-06-22'
    }, { 
      'series': 'efg',
      'value' : 789,
      'date'  : '2020-06-21'
    }, {
      'series': 'xyz',
      'value' : 234,
      'date'  : '2020-06-22'
    }, { 
      'series': 'tuv',
      'value' : 23442,
      'date'  : '2020-06-21'
    } ]

Basically i need to concatenate 2 list of maps to create a new one. is there any way to do this with less iteration??

const payload = [...payload1, ...payload2]?

CRice
– CRice

2020-06-23 15:00:53 +00:00
Commented Jun 23, 2020 at 15:00 — CRice
– CRice, Commented Jun 23, 2020 at 15:00

user13782377 · Accepted Answer · 2020-06-23 15:03:40Z

7

You can use the spread operator "..." to merge the elements of two objects or arrays into one.

let payload = [...payload1, ...payload2]

answered Jun 23, 2020 at 15:03

user13782377

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Comments

Rahul Bhobe · Accepted Answer · 2020-06-23 15:04:28Z

0

You may use the Array.concat() function.

let payload1 = [
    {
      'series': 'abc',
      'value' : 123,
      'date'  : '2020-06-22'
    }, { 
      'series': 'efg',
      'value' : 789,
      'date'  : '2020-06-21'
    } ];

    let payload2 = [
    {
      'series': 'xyz',
      'value' : 234,
      'date'  : '2020-06-22'
    }, { 
      'series': 'tuv',
      'value' : 23442,
      'date'  : '2020-06-21'
    } ];

let payload = payload1.concat(payload2);
console.log(payload);

answered Jun 23, 2020 at 15:04

Rahul Bhobe

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