How can I skip value in array using map or group elements in Array?

Question

I am trying to print a list of persons that share same address and company name My array:

persons = [
 { address: "Wallstreet",
  company: "ABC",
  name: "John",
  telephoneNr: "12345"
 },
 { address: "Wallstreet",
  company: "ABC",
  name: "Rick",
  telephoneNr: "12857"
 },
 { address: "Wallstreet",
  company: "ABC",
  name: "Eva",
  telephoneNr: "38665"
 }
]

I am using map function, but I want to print address and company name only once, since they all share same address and same company. How can I skip printing addresses and company name for the second, third and n time in the loop?

{persons.map((item, index) => {
  return (
    <p>
      {item.address}
    </p>
    <p>
      {item.company}
    </p>
    <p>
      {item.name}: {item.telephoneNr}
    </p>
)})}

My print looks like this:

Wallstreet
ABC
John:12345
Wallstreet
ABC
Rick:12857
Wallstreet
ABC
Eva: 38665

And I want my print to look like this:

Wallstreet
ABC
John:12345
Rick:12857
Eva: 38665

Madeefar Abbas · Accepted Answer · 2022-01-11 12:12:23Z

1

Please update this code:

{persons.map((item, index) => {
              return (
                if (index === 0) {
                   <p>
                    {item.address}
                   </p>
                   <p>
                    {item.company}
                   </p>
                   <p>
                    {item.name}: {item.telephoneNr}
                   </p>
               } else { 
                   <p>
                    {item.name}: {item.telephoneNr}
                   </p>
               }
              )})}

Your output will be look like this:

 Wallstreet
 ABC
 John:12345
 Rick:12857
 Eva: 38665

answered Jan 11, 2022 at 12:12

Madeefar Abbas

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1 Comment

Ar26 Over a year ago

It will work only if the address and company are in index 0

Ar26 · Accepted Answer · 2022-01-11 12:17:00Z

1

You can use Map object Map object

const map = new Map()
map.set([address, company].toString(), [{name, telephoneNr}])

then you need to get the value and set it with the new item and if the key is the same it will map to the same key-value pair and after that, you can iterate the map object and to print it

edited Jan 11, 2022 at 12:17

answered Jan 11, 2022 at 11:59

Ar26

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