Returning nothing with Void
In this lesson, you will learn how to explicitly mention something that does nothing.
Void means nothing. However, undefined can be assigned to void. The operation of setting undefined to void is not useful per se. However, a function that returns nothing should be marked with the reserved void keyword.
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TypeScript 3.3.4
function executeFunctionWithoutReturnType(): void {return undefined;}let returnType = executeFunctionWithoutReturnType(); // Hover the variable to see "void"console.log(returnType);
If a function is not explicitly marked with void as the return value, then by default, TypeScript will mark the return value as void. This may be problematic, because a programmer may return anything within the function. If it is explicitly set to void, ...