Table of contents
- 1. What is the Void Operator?
- 2. Preventing Unintended Return Values
- 3. Promises with Side Effects
- 5. Video Tutorial
undefined. Although it may not initially seem particularly useful, the void operator plays a significant role in preventing unintended leakage of return values and handling Promises for side effects.
What is the Void Operator?
The void operator evaluates a given expression and returns
undefined. For example, the expression
(1 + 2) can be transformed into
void (1 + 2), resulting in
Preventing Unintended Return Values
Consider the scenario of the
addUser function below. In certain cases, using the shorthand braceless syntax can cause issues when working with methods like
Array.push, which returns a
number type. To prevent unintended leakage of this return type, the void operator can be used. By utilizing the void operator in the
addUser function, the return value of
Array.pushsis suppressed, ensuring that the function itself doesn’t return anything:
Promises with Side Effects
Another common use case for the void operator is when dealing with Promises. If you simply want to initiate a Promise for its side effects and are not interested in handling its resolution, the void operator comes in handy. By using the void operator, you can bypass the need for explicitly handling the Promise’s resolution, allowing you to focus solely on the side effects.