When you are writing code, there may be times when you need to exit a function before it is completed. This can be done in Javascript using the return statement. In this article, we will discuss how to exit a function in Javascript, and provide some examples of how it can be done.
Return Function
The return statement is used to exit a function and return a value. The value that is returned can be anything, including objects, arrays, strings, or numbers. In most cases, the value that is returned is simply the result of the function. For example, if you have a function that calculates the sum of two numbers, the return statement would return the sum of those numbers.
If you do not want to return a value from a function, you can use the return statement without specifying a value. This will cause the function to exit immediately and will not execute any further code.
You can also use the return statement within an conditional statement. This allows you to exit a function based on certain conditions being met. For example, you could have a function that checks to see if a number is greater than ten. If it is, the function would return the string “greater than ten”, and if not, the function would return the string “less than ten”.
Throw Keyword
In some cases, you may want to exit a function and return an error. This can be done by using the throw keyword. The throw keyword will cause an error to be thrown and will stop the execution of the function. For example, if you have a function that calculates the sum of two numbers, but one of those numbers is not a number, you could use the throw keyword to exit the function and return an error.
Break Keyword
You can also use the break keyword to exit a loop inside a function. This will cause the loop to exit immediately and will not execute any further code.
Conclusion
The return statement is a powerful tool that can be used to control the flow of your code. It can be used to exit a function early, or to return a value from a function. In most cases, it is simply used to return the result of the function. However, you can also use it within an conditional statement or within a loop. The throw keyword can be used to exit a function and return an error, and the break keyword can be used to exit a loop inside a function. These keywords provide flexibility when writing code and allow you to control the flow of your program.