2.2 Records

• What is a record in computer science?

  A data structure grouping fields
• A record groups together related fields
• Records store fields of the same data type.

  False
• What is the process for declaring a record?

  Specify name and fields
• To access record fields, use the dot operator
• Records can simplify sorting operations in algorithms.
• How is searching data simplified using records?

  By grouping related fields
• Order the advantages of using records in algorithms:

  1️⃣ Data Organization

  2️⃣ Simplified Operations

  3️⃣ Improved Performance
• Match the algorithm operation with its corresponding code snippet:

  Sorting by age ↔️ people.Sort((a, b) => a.Age - b.Age);

  Finding by name ↔️ findByName(products, "Laptop");
• Records can be sorted based on multiple fields.
• What field is used to sort the 'people' array in the provided example?

  Age
• The 'findByName' function returns null if the target name is not found in the list
• Arrange the advantages of using records in algorithms by their descriptions:

  1️⃣ Groups related data, enhancing readability

  2️⃣ Performs simultaneous operations on multiple fields

  3️⃣ Efficient field access speeds up execution
• Records improve data organization by combining related fields into a single unit.
• What is a key difference between records and arrays in terms of data types?

  Records can hold different types
• Records use dot notation to access fields, while arrays use indexes
• Records are ideal for storing lists of homogeneous data.

  False
• Match the programming language with its record implementation features:

  Python ↔️ Classes with methods

  Java ↔️ Classes with inheritance

  C# ↔️ Structures with fields
• A record groups data fields of different data types into a single unit.
• What is a primary benefit of using records for data clarity?

  Improves code readability
• Records simplify access and manipulation of complex data
• Arrange the steps to declare a record:

  1️⃣ Specify the record's name

  2️⃣ Define the names of its fields

  3️⃣ Assign the data types of the fields
• The dot operator is used to access record fields.
• What syntax is used to access the 'Age' field in a 'Student' record?

  Student.Age
• What is the data type of the 'Name' field in the 'Student' record example?

  String
• To access record fields, use the dot operator (`.`) followed by the field name
• The dot operator is used to modify field values in a record.
• Steps to sort an array of 'Person' records by age in ascending order

  1️⃣ Create an array of 'Person' records

  2️⃣ Call the 'Sort' method with a lambda expression

  3️⃣ The lambda expression subtracts the ages of two 'Person' records
• What does the 'findByName' method return if no matching product is found?

  Null
• Match the advantage of using records in algorithms with its description:

  Data Organization ↔️ Groups related data, enhancing readability

  Simplified Operations ↔️ Performs simultaneous operations on multiple fields
• Arrays require elements of the same data type
• Records can hold fields of different data types, while arrays cannot.
• How is a record implemented in Python?

  Using classes
• In C#, records can be implemented using the `struct` keyword, which defines a value type
• Records in product inventory applications can track product details like name, price, and quantity.
• What is the primary benefit of using records in programming?

  Improves code readability