Write a function named all-unique in Scheme that takes a list as input and returns true if each item appears once only on the list and false otherwise. You may assume the list is flat (i.e., no nested lists). Hint: Consider writing a helper function contains that returns wither a list contains a given item. For example, • (all-unique '(a b c 1 2)) should return true • (all-unique '(a b c 1 a)) should return false (all-unique '()) should return true

Database System Concepts
7th Edition
ISBN:9780078022159
Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Chapter1: Introduction
Section: Chapter Questions
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in Scheme

 

### all-unique Function in Scheme

This task involves writing a function named `all-unique` in the Scheme programming language. The function should accept a list as input and return `true` if each element in the list appears only once. If any element appears more than once, it should return `false`. It is assumed that the list is flat, meaning it contains no nested lists.

**Hint:** It might be helpful to implement a helper function called `contains` that checks if a list contains a specific item.

#### Examples:

- `(all-unique '(a b c 1 2))` should return `true`.
- `(all-unique '(a b c 1 a))` should return `false`.
- `(all-unique '())` should return `true`. 

This function can be useful for validating data sets where uniqueness is required, such as in ensuring no repeated values in a configuration or options list.
Transcribed Image Text:### all-unique Function in Scheme This task involves writing a function named `all-unique` in the Scheme programming language. The function should accept a list as input and return `true` if each element in the list appears only once. If any element appears more than once, it should return `false`. It is assumed that the list is flat, meaning it contains no nested lists. **Hint:** It might be helpful to implement a helper function called `contains` that checks if a list contains a specific item. #### Examples: - `(all-unique '(a b c 1 2))` should return `true`. - `(all-unique '(a b c 1 a))` should return `false`. - `(all-unique '())` should return `true`. This function can be useful for validating data sets where uniqueness is required, such as in ensuring no repeated values in a configuration or options list.
Expert Solution
Step 1

The following problem is coded in Python programming language. As required, write a function all_unique which returns True if all the values in the list are unique, and False if all the values are not unique.

Technically speaking, Python is a high-level, object-oriented, dynamically integrated programming language that is largely used for the creation of websites and mobile applications. Since it provides possibilities for dynamic typing and dynamic binding, it is quite appealing in the realm of rapid application development. 

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