TypeScript void Function
Last Updated :
02 Nov, 2023
TypeScript is a popular programming language used for building scalable and robust applications. TypeScript void function is a function that doesn’t return any value, or returns undefined.
Syntax:
function functionName(parameters: ParameterType): void {
// Function body
// No return statement or return type annotation is needed
}
Where:
- functionName is the name of the function.
- parameters are optional parameters that the function may accept.
- void is the return type annotation that indicates that the function doesn’t return a value.
Example 1: In this example, function greet is the name of the function which is a void function, the name is the parameter, and its type is a string, indicating that the function expects a string argument.
Javascript
function greet(name: string): void {
console.log(`Hello, ${name}!`);
}
greet( "GeeksforGeeks" )
|
Output:
Example 2: In this example, logEvenNumbers is a void function that takes one parameter ‘max’ which is expected to be a number. Inside the function, it iterates through numbers from 0 to max and logs each even number to the console. Since it’s a void function, it doesn’t return a value.
Javascript
function logEvenNumbers(max: number): void {
for (let i = 0; i <= max; i++) {
if (i % 2 === 0) {
console.log(i);
}
}
}
logEvenNumbers(10)
|
Output:
Conclusion: In this article we have discussed about what is void fucntion and how to use it. Essentially, it indicates that the function performs some actions or computations but doesn’t produce a result that needs to be used or captured. It’s often used for functions that have side effects like logging into the console, modifying external state, or triggering asynchronous operations.
Reference: https://www.typescriptlang.org/docs/handbook/2/functions.html#void
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