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Ruby, how to swap the elements in an array?

2022-05-04 01:12 Santosh Gln imported from Stackoverflow

How do I swap an(example) array's second and third elements? I tried the following

def swap_elements(array)
array = ["blake", "ashley", "scott"]
    array[1], array[2] = array[2], array[1]
end

but I get

: ["scott", "ashley"]

I lost the first[0] element

1 answer

  • answered 2022-05-04 03:38 max

    There are many ways to do this - this is a functional approach that doesn't mutate the original array:

    def swap_elements(array)
  # yields the array to the block
  array.then do |first, *rest| # deconstruct the array  
    rest.reverse # swap the places of 2 & 3
        .unshift(first) # put the first back in
  end
end

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    "buyer_users": {
        "email":"peter245@email.com",
        "password":"123123123",
        "site_id":"103eb514-8185-4820-8f16-3a9d082c5f60",
        "account_id": "f362189f-a843-4c19-927a-845ce2cb0ad0"
    }
}'

    we seems to be picking up params, but everything is removed

    21:16:05 web.1         | Started POST "/buyer_users" for ::1 at 2022-05-06 21:16:05 -0700
21:16:05 web.1         | Processing by RegistrationsController#create as JSON
21:16:05 web.1         |   Parameters: {"{\n    \"buyer_users\": {\n        \"email\":\"peter245@email.com\",\n        \"password\":\"123123123\",\n        \"site_id\":\"103eb514-8185-4820-8f16-3a9d082c5f60\",\n        \"account_id\": \"f362189f-a843-4c19-927a-845ce2cb0ad0\"\n    }\n}"=>"[FILTERED]"}
21:16:05 web.1         | {}
21:16:05 web.1         | Completed 200 OK in 7ms (Views: 0.1ms | ActiveRecord: 0.0ms | Allocations: 1155)

    routes are set up like this

      devise_for :buyer_users, defaults: { format: :json },
             controllers: {
               registrations: 'registrations'
             }

    EDIT: after debugging some more it seems that the entire parameter is taken in as 1 string.

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end

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    it { should exist }
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      interface_name = file(json('/path/to/custom_attributes.json').params['networking']['interface_name'])
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    def interface_name
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hash = JSON.parse(json_string)
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end

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    [root@blah ~]# facter test
{
  /dev/sda1 => {
    disk_mapping => "",
    is_lvm_partitioned => "false",
    volumeid => "vol1234"
  },
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    disk_mapping => "xvdb1",
    is_lvm_partitioned => "true",
    volumeid => "vol5678"
  }
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    I'm sure this is something basic but I have searched far and wide and can't seem to find it. Can anyone shed some light?

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    SORT_ORDER = [
{column: 118, ascending: true},  // 3 = column number, sorting by descending order
{column: 119, ascending: true}, // 1 = column number, sort by ascending order 
{column: 117, ascending: true},
{column: 25, ascending: true}
];

function sortProductionLog(){
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var sheet = ss.getSheetByName(SHEET_NAME);
  var LastRow_WithValue = sheet.getLastRow();
  var LastColumn_WithValue = sheet.getLastColumn();
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  • Categorize similar transactions

    Given a list of transactions, some transactions are categorized, some transactions are not categorized. Find similar transactions and categorize them if possible. Similar transactions have the same targetAccount and the amount difference is not greater than 1000 (for all currencies) from the originally categorized transaction. If an uncategorized transaction is similar to more than one transaction, it should take the category from the one with the smallest amount difference. Transactions that cannot be categorized should still be included in the returned list. The returned list should preserve the order of the original list.

    categorizeSimilarTransactions(transactions)

    Input You can assume that the transactions parameter will always be present and valid. list of transactions (Transaction[])

    Output List of transactions(Transaction[]) with enhanced categorization if possible.

    This is what a categorized transaction looks like:

        {
      id: "bfd6a11a-2099-4b69-a7bb-572d8436cf73",
      sourceAccount: "my_account",
      targetAccount: "coffee_shop",
      amount: -350,
      currency: "EUR",
      category: "eating_out",
      time: "2021-03-12T12:34:00Z"
    }

    An uncategorized transaction does not have category property. This is what an uncategorized transaction looks like:

        {
      id: "0f0ffbf9-2e26-4f5a-a6c0-fcbd504002f8",
      sourceAccount: "my_account",
      targetAccount: "eating_out",
      amount: -1900,
      time: "2021-03-12T12:34:00Z"
    }

    The following two transactions are similar:

        {
      id: "bfd6a11a-2099-4b69-a7bb-572d8436cf73",
      sourceAccount: "my_account",
      targetAccount: "coffee_shop",
      amount: -350,
      category: "eating_out",
      time: "2021-03-12T12:34:00Z"
    }

    and

        {
      id: "a001bb66-6f4c-48bf-8ae0-f73453aa8dd5",
      sourceAccount: "my_account",
      targetAccount: "coffee_shop",
      amount: -620,
      time: "2021-04-10T10:30:00Z"
    }

    Input

        categorizeSimilarTransactions([
      {
        id: "a001bb66-6f4c-48bf-8ae0-f73453aa8dd5",
        sourceAccount: "my_account",
        targetAccount: "coffee_shop",
        amount: 350,
        time: "2021-04-10T10:30:00Z",
      },
      {
        id: "bfd6a11a-2099-4b69-a7bb-572d8436cf73",
        sourceAccount: "my_account",
        targetAccount: "coffee_shop",
        amount: -150,
        category: "eating_out",
        time: "2021-03-12T12:34:00Z",
      },
      {
        id: "6359091e-1187-471f-a2aa-81bd2647210f",
        sourceAccount: "my_account",
        targetAccount: "coffee_shop",
        amount: 100,
        category: "entertainment",
        time: "2021-01-12T08:23:00Z",
      },
      {
        id: "a8170ced-1c5f-432c-bb7d-867589a9d4b8",
        sourceAccount: "my_account",
        targetAccount: "coffee_shop",
        amount: -1690,
        time: "2021-04-12T08:20:00Z",
      },
    ]);

    Expected Output

        [
      {
        id: "a001bb66-6f4c-48bf-8ae0-f73453aa8dd5",
        sourceAccount: "my_account",
        targetAccount: "coffee_shop",
        amount: 350,
        category: "entertainment",
        time: "2021-04-10T10:30:00Z",
      },
      {
        id: "bfd6a11a-2099-4b69-a7bb-572d8436cf73",
        sourceAccount: "my_account",
        targetAccount: "coffee_shop",
        amount: -150,
        category: "eating_out",
        time: "2021-03-12T12:34:00Z",
      },
      {
        id: "6359091e-1187-471f-a2aa-81bd2647210f",
        sourceAccount: "my_account",
        targetAccount: "coffee_shop",
        amount: 100,
        category: "entertainment",
        time: "2021-01-12T08:23:00Z",
      },
      {
        id: "a8170ced-1c5f-432c-bb7d-867589a9d4b8",
        sourceAccount: "my_account",
        targetAccount: "coffee_shop",
        amount: -1690,
        time: "2021-04-12T08:20:00Z",
      },
    ];

    I could find a solution but it's a brute-force approach & not efficient. Is there any other solution with less time complexity may be O(n) or O(log(n))/O(nlog(n)) which is easy to read & understand

          const categorizeSimilarTransactions = (transactions) => {
        if (!(Array.isArray(transactions) && transactions.length)) return [];
          const categorizedTransactions = transactions.filter(t => t.category);
          const uncategorizedTransactions = transactions.filter(t => !t.category);

          let lowestDiff;
          uncategorizedTransactions.forEach(uncategorizedTransaction => {
              lowestDiff = Math.min();
              categorizedTransactions.forEach(cat => {
                  if (cat.targetAccount === uncategorizedTransaction.targetAccount) {
                      lowestDiffComp = Math.abs(cat.amount - uncategorizedTransaction.amount);

                      if (lowestDiffComp < lowestDiff && lowestDiffComp < 1000) {
                          lowestDiff = lowestDiffComp;
                          uncategorizedTransaction.category = cat.category;
                      }
                  }
              })
          });
          const merged = [...categorizedTransactions, ...uncategorizedTransactions];
          const orderIds = transactions.map(transaction => transaction.id);
          merged.sort((a, b) => {
              return orderIds.indexOf(a.id) - orderIds.indexOf(b.id);
          })
          return merged;
      };