setValueT

setValueT is a generic utility concept used to assign a value of type T to a target that holds a value of that type, aiming to preserve type safety in languages with generics. It is typically described as a function or method that enforces that the new value conforms to the same type parameter T as the target.

A common form of the signature in a TypeScript-like language is setValueT<T>(target: { value: T }, newValue: T): void. The function mutates the target so that target.value becomes newValue. Some implementations may instead return a new object with the updated value to support immutable patterns, e.g., returning { ...target, value: newValue }. The choice between mutation and immutability depends on the surrounding codebase’s design.

Usage examples illustrate its role in simple state updates. Given const obj = { value: 1 }; setValueT<number>(obj, 42); obj.value now equals 42. In a class context, a setter-like use might be demonstrated as setValueT(this, newValue) where this.value is of type T. In strongly typed environments, the type parameter T ensures that only values of the correct type are accepted, and attempts to pass a mismatched type will produce compile-time errors.

Common considerations include the distinction between mutating the original target versus returning a new updated object, and how runtime type checks may or may not exist depending on the language. See also setValue, setValueUnsafe, and related state-management or immutable-update utilities.