How to filter array in react native?-CodePudding

I have array

 const arr = [
    {id: 1, country: 'Austria'},
    {id: 2, country: 'Germany'},
    {id: 3, country: 'Austria'},
  ];

I tried the following the code

arry.map((item,idx) => (

      item.orderstatuszerodha== "done"?(
        
       console.log(item.id)
      )
      :
      null
  
    ))

output is 1 3 but I want to get output after whole filter like 1,3

I want only the id where country=Austria

like this

1,3

CodePudding user response：

use reduce function

const arry = [
    {id: 1, country: 'Austria'},
    {id: 2, country: 'Germany'},
    {id: 3, country: 'Austria'},
  ];
  
   const result = arry.reduce((acc,item,idx) => {
    
          if(item.country == "Austria"){
             if(idx === 0) acc  = item.id
             else acc  = `,${item.id}`
           }
           
           return acc
      
    }, '')
    
    console.log(result)

CodePudding user response：

This is How I Filter

const arry = [
    {id: 1, country: 'Austria'},
    {id: 2, country: 'Germany'},
    {id: 3, country: 'Austria'},
];

const result = arry.filter((item, index) => {

      if(item.country == "Austria"){
         return true
       }
       
       else{
        return false
       }
  
})

console.log(result)

CodePudding user response：

One line answer:

arr.filter(i => i.country == 'Austria')