Operators are functions, that can be used to express logic. They are the reason why Lowdefy apps are not completely static, but can react to data and inputs. Operators can be used in blocks, actions, requests, and connections. See the specific documentation for more details.
Each operators expects arguments with a specific structure. They can be the result of other operators, since operators are evaluated beginning with the most nested operators.
If an operator errors while evaluating, it returns a null value, and logs the error to the console.
Client or server operators
Some operators are only available on either the client or the server. For example, the _menu operator is only useful on the client and is thus not included in server requests. Likewise, the _secret operator is only available on the server for security reasons.
If a operator has special environment considerations, it is indicated on the individual operator documentation page. If no indication is made, the operator can be used under both environments.
Client only operators:
Server only operators:
Operators that are client side only cannot be used in Requests and Connections, and operators which are server side only cannot be used in Blocks and Actions.
Build time operators
Besides the client and server environment, app build time is considered a third environment where special operator logic applies.
The _ref and _var operators do not work like other operators. They are evaluated while an app is being built, and can thus be used anywhere in the app configuration. They are used to split a app into multiple files, and to reuse configuration. See _ref for more details.