WHITELIST

DESCRIPTION

The whitelist contract allows users to add their addresses to a whitelist. Only non-whitelisted addresses can be added, and the number of whitelisted addresses cannot exceed the maximum limit. The contract provides a function to add an address to the whitelist and another function to check if an address is already whitelisted. It offers a basic mechanism for managing whitelisted addresses.

FUNCTIONS

1. addAddressToWhitelist() public: This function allows the sender (caller) to add their address to the whitelist. It performs the following steps:

• Checks if the sender's address is not already whitelisted.

• It checks if the maximum number of whitelisted addresses (maxWhitelistedAddresses) has not been reached.

• Adds the sender's address to the whitelistedAddresses mapping by setting it to true.

• Increments the numAddressesWhitelisted variable.

1. checkAddress(address user) public view returns(bool): This function checks whether a given address is whitelisted or not. It takes an address as input and returns a boolean value indicating whether the address is whitelisted (true) or not (false).

2. numAddressesWhitelisted()

3. maxWhitelistedAddresses()

EXTRA PARAMETERS

Contract Level: Easy

Utility Tags: Whitelist , Address Whitelist, Access Control

1. maxWhitelistedAddresses: Integer

USES

1. Token Sales: A whitelist can be used to ensure that only whitelisted addresses can participate in a token sale or contribute to a crowdfunding campaign.

2. Restricted Features: Certain features or functionalities of a decentralized application (dApp) can be limited to whitelisted addresses, allowing only authorized users to access or use them.

3. Membership Systems: Whitelisting addresses can be employed to create membership systems where only whitelisted members can access specific resources, services, or events.

4. Administrative Actions: The contract can make administrative actions or control over some parts of a system easier by whitelisting certain addresses. For example, it can give authorized participants special rights or privileges.

5. Compliance and Regulation: Whitelisting can assist in adhering to regulatory requirements by allowing only verified or approved addresses to perform certain activities within a system.