Inversion of control is about transferring control from library to the client. It makes more sense when we talk about a client that injects (passes) a function value (lambda expression) into a higher order function (library function) that controls (changes) the behavior of the library function.
So, a simple implementation (with huge implications) of this pattern is a higher order library function (which accepts another function as an argument). The library function transfers control over its behavior by giving the client the ability to supply the "control" function as an argument.
For example, library functions like "map", "flatMap" are IoC implementations.
Of course, a limited IoC version is, for example, a boolean function parameter. A client may control the library function by switching the boolean argument.
A client or framework that injects library dependencies (which carry behavior) into libraries may also be considered IoC