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Combine arrays of objects by unique key


Combine arrays of objects by unique key

By : andrewsheelan
Date : November 20 2020, 01:01 AM
wish of those help Let's have a go at this in native JS.
First, let's turn those 2 arrays into more sensible objects:
code :
function reduceDates(prev, curr){
    var date = Object.keys(curr)[0]; // This is why {date : value} makes no sense.
    prev[date] = curr[date];
    return prev;
}

var v = visitors.reduce(reduceDates, {});  // {2014.12.25: 141, 2014.12.26: 630, 2014.12.30: 71}
var d = documents.reduce(reduceDates, {}); // {2014.12.15: 31,  2014.12.26: 60,  2014.12.30: 95}
var combined = {};
for(var key in v){
    combined[key] = { date: key, visits: v[key], docs: 0 };
}
for(var key in d){
    combined[key] = combined[key] || { date: key, visits: 0 };
    combined[key].docs = d[key];
}
{
  "2014.12.25": { date: "2014.12.25", visits: 141, docs: 0 },
  "2014.12.26": { date: "2014.12.26", visits: 630, docs: 60 },
  "2014.12.30": { date: "2014.12.30", visits: 71,  docs: 95 },
  "2014.12.15": { date: "2014.12.15", visits: 0,   docs: 31 }
}
var result = [];
for(var key in combined){
    result.push(combined[key]);
}
[
  { date: "2014.12.25", visits: 141, docs: 0 },
  { date: "2014.12.26", visits: 630, docs: 60 },
  { date: "2014.12.30", visits: 71,  docs: 95 },
  { date: "2014.12.15", visits: 0,   docs: 31 }
]


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Fastest way to combine unique integers from 2 arrays

Fastest way to combine unique integers from 2 arrays


By : thatguy
Date : March 29 2020, 07:55 AM
Hope this helps You're looking for the EXOR of the two sets. I think this is simpler than it looks, due to the arrays being pre-sorted. Pseudo-code
compare the first element from each array if unequal, add the larger one to the unique set else remove both elements if you've reached the end of one array, add all the elements remaining in the other array to the unique set
code :
/**
 * Returns the sorted EXOR of two sorted int arrays (descending). Uses
 * arrays, index management, and System.arraycopy.
 * @author paislee
 */
int[] arrExor(int[] a1, int[] a2) {

    // eventual result, intermediate (oversized) result
    int[] exor, exor_builder = new int[a1.length + a2.length];
    int exor_i = 0; // the growing size of exor set

    int a1_i = 0, a2_i = 0; // input indices
    int a1_curr, a2_curr; // elements we're comparing

    // chew both input arrays, greedily populating exor_builder
    while (a1_i < a1.length && a2_i < a2.length) {

        a1_curr = a1[a1_i];
        a2_curr = a2[a2_i];

        if (a1_curr != a2_curr) {
            if (a1_curr > a2_curr)
                exor_builder[exor_i++] = a1[a1_i++];
            else
                exor_builder[exor_i++] = a2[a2_i++];
        } else {
            a1_i++;
            a2_i++;
        }        
    }

    // copy remainder into exor_builder
    int[] left = null; // alias for the unfinished input
    int left_i = 0, left_sz = 0; // index alias, # elements left

    if (a1_i < a1.length) {
        left = a1;
        left_i = a1_i;
    } else {
        left = a2;
        left_i = a2_i;
    }

    left_sz = left.length - left_i;
    System.arraycopy(left, left_i, exor_builder, exor_i, left_sz);
    exor_i += left_sz;

    // shrinkwrap and deliver
    exor = new int[exor_i];
    System.arraycopy(exor_builder, 0, exor, 0, exor_i);
    return exor;
}
combine two arrays in php in unique case

combine two arrays in php in unique case


By : Gil Arauz
Date : March 29 2020, 07:55 AM
it should still fix some issue Just use array_combine, $b as keys and $a as values, then transfer to a new container grouping them with the key:
code :
$array = array();
foreach(array_combine($b, $a) as $k => $v) {
    $array[$v][] = $k;
}
foreach($array as $key => $numbers) {
    $href = implode('|', $numbers);
    $numbers = $key . '(' . implode(' | ', $numbers) . ')' . ' ';
    echo "<a href='aaa.php?numbers=$href'>$numbers</a>";
}
JavaScript - How to put all of the objects from several nested arrays into a new array of unique objects

JavaScript - How to put all of the objects from several nested arrays into a new array of unique objects


By : Matias Olivares Truj
Date : March 29 2020, 07:55 AM
fixed the issue. Will look into that further You can use Array methods like reduce and filter to get your list of unique modules:
code :
var packages = [
  { id: 1, modules:[{ id: 1, name: 'module1' }, { id: 2, name: 'module2' }]},
  { id: 2, modules:[{ id: 1, name: 'module1' }, { id: 3, name: 'module3' }]},
  { id: 3, modules:[{ id: 2, name: 'module2' }, { id: 4, name: 'module4' }]} 
]

var result = packages.reduce(function (a, e) {
  return a.concat(e.modules)
}, []).filter(function (e) {
  return !this[e.id] && (this[e.id] = true)
}, {})

console.log(result)
filter file by unique and biggest value; combine two arrays into hash

filter file by unique and biggest value; combine two arrays into hash


By : MetalRufflez
Date : March 29 2020, 07:55 AM
This might help you I need to extract by unique genus (first part of the name of species) in one column but with by biggest number in another column in a CSV file when having multiples of the same name. , Properly naming the variables makes the code more readable:
code :
#! /usr/bin/perl
use warnings;
use strict;

my %selected;
while (<>) {
    my ($species, $value) = (split /,/)[3, 5];
    my $genus = (split ' ', $species)[0];
    if ($value > ($selected{$genus}{max} || 0)) {
        $selected{$genus}{max} = $value;
        $selected{$genus}{line} = $_;
    }
}
for my $genus (keys %selected) {
    print $selected{$genus}{line};
}
Combine array of objects, combine key with same value and keep unique value

Combine array of objects, combine key with same value and keep unique value


By : user3357172
Date : March 29 2020, 07:55 AM
hop of those help? You could group by id and name properity and store the index for the same group.
code :
var data = [{ id: 1, name: "Liquid", playername: "GH" }, { id: 1, name: "Liquid", playername: "KuroKy" }, { id: 1, name: "Liquid", playername: "Miracle" }, { id: 1, name: "Liquid", playername: "w33" }, { id: 1, name: "Liquid", playername: "Mind-Control" }],
    result = Object
        .values(data.reduce((r, { id, name, playername }) => {
            var key = [id, name].join('|');
            r[key] = r[key] || { data: { id, name }, index: 0 };
            r[key].data['playername' + (r[key].index++ || '')] = playername;
            return r;
        }, {}))
        .map(({ data }) => data);

console.log(result);
.as-console-wrapper { max-height: 100% !important; top: 0; }
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