Rename Columns solution and explanation

import pandas as pd

def rename_columns(df):
    return df.rename(columns={
        'id': 'student_id',
        'first': 'first_name',
        'last': 'last_name',
        'age': 'age_in_years'
    })

# Example Usage
students = pd.DataFrame({
    'id': [1, 2, 3, 4, 5],
    'first': ['Mason', 'Ava', 'Taylor', 'Georgia', 'Thomas'],
    'last': ['King', 'Wright', 'Hall', 'Thompson', 'Moore'],
    'age': [6, 7, 16, 18, 10]
})

renamed_students = rename_columns(students)
print(renamed_students)

function renameColumns(objArray) {
    return objArray.map(({ id, first, last, age, ...rest }) => ({
        student_id: id,
        first_name: first,
        last_name: last,
        age_in_years: age,
        ...rest
    }));
}

// Example Usage
const students = [
    { id: 1, first: 'Mason', last: 'King', age: 6 },
    { id: 2, first: 'Ava', last: 'Wright', age: 7 },
    { id: 3, first: 'Taylor', last: 'Hall', age: 16 },
    { id: 4, first: 'Georgia', last: 'Thompson', age: 18 },
    { id: 5, first: 'Thomas', last: 'Moore', age: 10 }
];

console.log(renameColumns(students));

import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;

class Student {
    int student_id;
    String first_name;
    String last_name;
    int age_in_years;

    Student(int id, String first, String last, int age) {
        this.student_id = id;
        this.first_name = first;
        this.last_name = last;
        this.age_in_years = age;
    }

    @Override
    public String toString() {
        return student_id + ", " + first_name + ", " + last_name + ", " + age_in_years;
    }
}

public class Main {
    public static void main(String[] args) {
        List<Map<String, Object>> students = new ArrayList<>();
        addStudent(students, 1, "Mason", "King", 6);
        addStudent(students, 2, "Ava", "Wright", 7);
        addStudent(students, 3, "Taylor", "Hall", 16);
        addStudent(students, 4, "Georgia", "Thompson", 18);
        addStudent(students, 5, "Thomas", "Moore", 10);

        List<Student> renamedStudents = renameColumns(students);
        for (Student student : renamedStudents) {
            System.out.println(student);
        }
    }

    static void addStudent(List<Map<String, Object>> list, int id, String first, String last, int age) {
        Map<String, Object> student = new HashMap<>();
        student.put("id", id);
        student.put("first", first);
        student.put("last", last);
        student.put("age", age);
        list.add(student);
    }

    static List<Student> renameColumns(List<Map<String, Object>> original) {
        List<Student> renamed = new ArrayList<>();
        for (Map<String, Object> entry : original) {
            renamed.add(new Student(
                (int) entry.get("id"),
                (String) entry.get("first"),
                (String) entry.get("last"),
                (int) entry.get("age")
            ));
        }
        return renamed;
    }
}

using System;
using System.Collections.Generic;
using System.Data;

class Program {
    static void Main() {
        DataTable students = new DataTable();
        students.Columns.Add("id", typeof(int));
        students.Columns.Add("first", typeof(string));
        students.Columns.Add("last", typeof(string));
        students.Columns.Add("age", typeof(int));

        students.Rows.Add(1, "Mason", "King", 6);
        students.Rows.Add(2, "Ava", "Wright", 7);
        students.Rows.Add(3, "Taylor", "Hall", 16);
        students.Rows.Add(4, "Georgia", "Thompson", 18);
        students.Rows.Add(5, "Thomas", "Moore", 10);

        RenameColumns(students);

        foreach (DataRow row in students.Rows) {
            Console.WriteLine(string.Join(", ", row.ItemArray));
        }
    }

    static void RenameColumns(DataTable table) {
        table.Columns["id"].ColumnName = "student_id";
        table.Columns["first"].ColumnName = "first_name";
        table.Columns["last"].ColumnName = "last_name";
        table.Columns["age"].ColumnName = "age_in_years";
    }
}