Modifiers in Solidity are reusable code fragments that wrap function execution. They are commonly used to express access control and invariant checks. A modifier typically executes a condition, then continues with the original function body at the placeholder token (represented by _). This enables systematic reasoning: access control policies appear once and apply consistently to many functions.
Require, revert, and errors
Content is available with subscription.
Get full access to all courses on the platform for one year with a single payment.
▼
Unlike other platforms that charge per course, here you get everything for one price, and after one year of use there will be no automatic charge for the following year.