in Scheme please, i need help ### Scheme Programming: Implementing an `all-unique` FunctionThis educational page demonstrates how to write a Scheme function named `all-unique`. The goal of the function is to examine a provided list and return `true` if every element appears only once. Conversely, if any elements are duplicated, the function should return `false`. The list is assumed to be flat, without nested lists.#### Instructions:1. **Function Specifications:** - **Function Name:** `all-unique` - **Input:** A single list. - **Output:** A boolean value (`true` or `false`).2. **Implementation Considerations:** - Consider creating a helper function, `contains`, that checks whether a given item exists within a list.3. **Example Usage:** - `(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`.#### Code Example:Below is a sample code snippet showing a partial implementation of the `all-unique` function in Scheme.```scheme(define (all-unique lst def) (if (and (null? def) (if (equal? lst) 0)) '() ) (if all-unique lst ((!- (all-unique lst ))```**Note:** The code shown above is incomplete and serves as an illustrative starting point for building the `all-unique` function. It is important to further develop the logic to handle list iteration and uniqueness checks effectively.

Answered: Write a function named all-unique in…

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

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in Scheme please, i need help

### Scheme Programming: Implementing an `all-unique` Function

This educational page demonstrates how to write a Scheme function named `all-unique`. The goal of the function is to examine a provided list and return `true` if every element appears only once. Conversely, if any elements are duplicated, the function should return `false`. The list is assumed to be flat, without nested lists.

#### Instructions:

1. **Function Specifications:**
- **Function Name:** `all-unique`
- **Input:** A single list.
- **Output:** A boolean value (`true` or `false`).

2. **Implementation Considerations:**
- Consider creating a helper function, `contains`, that checks whether a given item exists within a list.

3. **Example Usage:**
- `(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`.

#### Code Example:

Below is a sample code snippet showing a partial implementation of the `all-unique` function in Scheme.

```scheme
(define (all-unique lst def)
(if (and (null? def)
(if (equal? lst) 0))
'()
)
(if all-unique lst ((!- (all-unique lst ))
```

**Note:** The code shown above is incomplete and serves as an illustrative starting point for building the `all-unique` function. It is important to further develop the logic to handle list iteration and uniqueness checks effectively.

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