Mastering Blockchain Programming with Solidity

The isApprovedForAll function

The isApprovedForAll() function is used to check that the given operator has operator rights on the given owner's tokens.

This function takes the following arguments:

• owner: The address of owner of the tokens who has given full approvals before
• operator: The address of operator that has received the approval from owner before

This function returns a Boolean value. The following are the return values:

• true: The owner has previously given full approvals to the operator
• false: The owner has not given approval to the operator

Let's look at the isApprovedForAll() function code:

function isApprovedForAll(address owner, address operator) public view returns (bool) {    return _operatorApprovals[owner][operator];}