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Kotlin: Can I access a nested array from inside another array?


Kotlin: Can I access a nested array from inside another array?

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Kotlin: Can I access a nested array from inside another array?
Tag : arrays , By : John Q.
Date : November 27 2020, 01:01 AM

may help you . Your outer array contains Ints, and an array. So its actual declared type (that you could specify, or could let the IDE specify for you), is Array.
A Serializable could be anything. The compiler doesn't know that the element at index 2 happens to be an array. So it can't let you use the [] operator on it. You need to cast the element to an array to be able to do that:
println((testarray[2] as Array<Int>)[1])

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What can I do to access to the properties of an object inside a nested array?


Tag : javascript , By : jrf
Date : March 29 2020, 07:55 AM
this one helps. I have an array named sportPromise which looks like: , You can access it by iterating through each nested scope:
for (var i=0; i< sportPromise.length; i++) { 
   for (var j=0; j < sportPromise[i].length; j++) { 
      console.log( sportPromise[i][j]['name'] );
   }
}

Access array value inside a nested object in Javascript


Tag : javascript , By : jim
Date : March 29 2020, 07:55 AM
may help you . I believe there are few types of JSON objects we work with in daily life:
!(function(){
  //data always like this:
  // this just an array 
  var json_array = [
    {id:1, name:"alex", age: 11},
    {id:2, name:"bob", age: 12},
    {id:3, name:"nn", age: 13},
  ];
 
  // page total_page don't need loop, direct use it
  var json_object = {
    page: 1,
    total_page: 20,
    total_item: 300,
    list: [
      {id:1, name:"alex", age: 11},
      {id:2, name:"bob", age: 12},
      {id:3, name:"nn", age: 13},
    ]
  }
  // or   for(var id in list_object){ console.log(list_object[id]['name'])  }
  var list_object = {
    1: {id:1, name:"alex", age: 11},
    2: {id:2, name:"bob", age: 12},
    3: {id:3, name:"nn", age: 13},
  }
  
  // your data need some change
  var data = {                    
      "key" : "value",
      "key" : "value",        
      "key1" : {

          "key11" : [
              {"key" : "value"},
              {"key" : "value"}
          ],

          "key12" : [
              {"key" : "value"},
              {"key" : "value"}
          ],
          "key13" : [
              {"key" : "value"},
              {"key" : "value"}
          ],
      }
  }
  
  // loop object
  for(var i in data['key1']){
    // loop array
    data['key1'][i].map(function(item, i){
      console.log(item['key'])
    })
  }

})()

How to push data from a nested array, inside an array of objects, to a new array? while maintaining its nested structure


Tag : javascript , By : Rik
Date : March 29 2020, 07:55 AM
I hope this helps you . I have an array that contains multiple objects. These objects also contain arrays of objects like this: , Just .map the interests of each item:
const data=[{id:1,name:"Jack",interests:[{id:9,name:"basketball"},{id:8,name:"art"}]},{id:2,name:"Jenny",interests:[{id:7,name:"reading"},{id:6,name:"running"}]}]
const mapped = data.map(({ interests }) => interests);
console.log(mapped);
const data=[{id:1,name:"Jack",interests:[{id:9,name:"basketball",foo:'bar'},{id:8,name:"art",foo:'bar'}]},{id:2,name:"Jenny",interests:[{id:7,name:"reading",foo:'bar'},{id:6,name:"running",foo:'bar'}]}]
const mapped = data.map(({ interests }) =>
  // Use only `id` and `foo` properties, discard the `name`s:
  interests.map(({ id, foo }) => ({ id, foo }))
);
console.log(mapped);

How to access an object nested inside an array by the value of one of its keys?


Tag : javascript , By : quasarkitten
Date : March 29 2020, 07:55 AM
I hope this helps . If the author can appear multiple times, you can .filter() the array stored at author and then .map() the results to the count:
const data = {data:{postsConnection:{groupBy:{author:[{key:"xyz",connection:{aggregate:{count:5}}},{key:"abc",connection:{aggregate:{count:3}}}]}}}};

const author = "xyz";
const res = data.data.postsConnection.groupBy.author.filter(({key}) => key === author).map(obj => obj.connection.aggregate.count);

console.log(res);

// If you want to get the total of all counts for the given author, you can use reduce on the result to sum:
const totalCountsForAuthor = res.reduce((acc, n) => acc+n, 0);
console.log(totalCountsForAuthor);
const data = {data:{postsConnection:{groupBy:{author:[{key:"xyz",connection:{aggregate:{count:5}}},{key:"abc",connection:{aggregate:{count:3}}}]}}}};

const author = "xyz";
const res = data.data.postsConnection.groupBy.author.find(({key}) => key === author).connection.aggregate.count

console.log(res);

How can I access a nested object inside an array to validate it?


Tag : javascript , By : Nate Bedortha
Date : March 29 2020, 07:55 AM
With these it helps This is my schema:
values.detail.forEach(d=> console.log(d.product));
let invalidItems = values.detail.filter(d => !d.product || !d.quantity || 
!d.product.name);
this.values.detail.forEach(i => 
{
 let detailErrors = {'quantity': null, product: null};


if (!i.quantity)
  {
    detailErrors.quantity= 'Required'
  }
 if (!i.product)
  {
   detailErrors.product = 'Required'
  }
if (i.product && !i.product.price)
  {
    detailErrors.product = {'price' :'Required'}
  }

});
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