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Removing duplicate keys from object array


Removing duplicate keys from object array

By : Arm Exceptional
Date : October 23 2020, 08:10 PM
To fix this issue You could take a hash table for collecting values of same keys and map later to single key/value pairs.
code :
let array = [{ sector: "adad" }, { sector: "adadasdsd" }, { sector: "sdsdsd" }, { origin: "sdfsf" }, { destination: "dfsfsdf" }],
    grouped = Object
        .entries(array.reduce(
            (r, o) => (
                Object.entries(o).forEach(([k, v]) => (r[k] = r[k] || []).push(v)),
                r
            ),
            Object.create(null)
        ))
        .map(([k, v]) => ({ [k]: v }));
   
console.log(grouped);


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AngularJS ng-repeat issue with removing duplicate keys in an object

AngularJS ng-repeat issue with removing duplicate keys in an object


By : Gontse Kennedy Mangw
Date : March 29 2020, 07:55 AM
I hope this helps . So I found a solution which works for me. I followed this AngularJs filter on nested ng-repeat. I made a couple changes for my data model, but it's the same idea.
Convert Array to Hash removing duplicate keys and adding values at the same time

Convert Array to Hash removing duplicate keys and adding values at the same time


By : BWE_CO-OP
Date : March 29 2020, 07:55 AM
I hope this helps you . I have an array that looks like so: , This works:
code :
result = Hash.new(0)
f = [["Wed, 12-31", 120.0],["Thu, 01-01", 120.0], ["Thu, 01-01", 120.0]]
f.each { |subarray| result[subarray[0]] += subarray[1] }
puts result
Removing duplicate items from array but merging duplicate keys

Removing duplicate items from array but merging duplicate keys


By : Vivek L
Date : March 29 2020, 07:55 AM
around this issue I would first flip the array. Create a new array with the phone number as the key. Something like this:
code :
$numbers = [];
foreach($phone AS $type => $number) { 
    $numbers[$number][] = $type;
}
foreach($numbers AS $number => $types) {
    echo $number . " (" . implode(",",$types) . ")";
}
Removing elements from an array of objects based on duplicate values of multiple keys

Removing elements from an array of objects based on duplicate values of multiple keys


By : alinpgheorghe
Date : March 29 2020, 07:55 AM
I wish did fix the issue. You can use pure functions by using Array.some() and Array.reduce() to reduce your input array to array of distinct elements as shown below
code :
    var arr = [
        { type_id: "3", full_empty:"true", quantity:1},
        { type_id: "3", full_empty:"true", quantity:1},
        { type_id: "9", full_empty:"true", quantity:4},
        { type_id: "9", full_empty:"false", quantity:4},
        { type_id: "9", full_empty:"true", quantity:4},
        { type_id: "9", full_empty:"true", quantity:4},
        { type_id: "9", full_empty:"true", quantity:4}
    ];

    var a = arr.reduce(function (accumulator, current) {
      if (checkIfAlreadyExist(current)) {
        return accumulator
      } else {
        return accumulator.concat([current]);
      }
      
      function checkIfAlreadyExist(currentVal) {
        return accumulator.some(function(item){
          return (item.type_id === currentVal.type_id &&
                  item.full_empty === currentVal.full_empty);
        });
      }
    }, []);
        
    console.log(a);
var arr = [
            { type_id: "3", full_empty:"true", quantity:1},
            { type_id: "3", full_empty:"true", quantity:1},
            { type_id: "9", full_empty:"true", quantity:4},
            { type_id: "9", full_empty:"false", quantity:4},
            { type_id: "9", full_empty:"true", quantity:4},
            { type_id: "9", full_empty:"true", quantity:4},
            { type_id: "9", full_empty:"true", quantity:4}
        ];

var a = arr.reduce((accumulator, current) => {
  if (checkIfAlreadyExist(current)) {
    return accumulator;
  } else {
    return [...accumulator, current];
  }

  function checkIfAlreadyExist(currentVal) {
    return accumulator.some((item) => {
      return (item.type_id === currentVal.type_id &&
              item.full_empty === currentVal.full_empty);
    });
  }
}, []);
            
console.log(a);
Removing duplicate keys from python dictionary but concatenating the values of duplicated keys

Removing duplicate keys from python dictionary but concatenating the values of duplicated keys


By : user2230001
Date : March 29 2020, 07:55 AM
Any of those help There's no need to explicitly initialize the values with empty lists, use defaultdict:
code :
from collections import defaultdict

lista = ['winter', 'fall', 'spring', 'summer', 'winter', 'spring']
listb = ['cold', 'rainy', 'windy', 'hot', 'chilly', 'wet']

d = defaultdict(list)
for x, y in zip(lista, listb):
    d[x].append(y)

print(dict(d))
{'winter': ['cold', 'chilly'], 'fall': ['rainy'], 'spring': ['windy', 'wet'], 'summer': ['hot']}
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