JavaScript The purpose of : “if(boolean) return;”. in Javascript function boolean return,function boolean return vb.net

Consider the following code:

if(boolean) return;

What is the purpose if this condition?

Is it logically the same as:

if(boolean) { return true; }

Thank you for answering!

Answer:1

return; with no value is equivalent to return undefined;. But it's usually used in functions that aren't expected to return a value, so it just means "exit the function now".

So that code is equivalent to:

if (boolean) {
    return undefined;
}
Answer:2

Basically, in the first case you don't care about the return value: return by itself is often used to stop a function when a particular condition is met.

The second case if radically different: return true means you're interested in the return value of a function: for example, a function called isEmpty() that checks if a given list contains at least one element is expected to return a value that can be either true or false. In this case, the return statement alone would have no meaning.

Answer:3

if(boolean) { return true; } means if a condition is correct return true

if(boolean) return;

means if a condition is true stop Its used for different purpose, an example is validation, if a condition doesnt meet the criteria of a function just stop running.

Answer:4

The first one executes the if statement and returns back an "undefined" return call irrespective of the result from the if statement. The second one returns a true Boolean only if the if statement is true.

Answer:5

Let consider an example, you have a text box and a submit button. You want to validate the textbox for not being submitted with empty.

function validateForm() {
var x = document.forms["myForm"]["fname"].value;
if (x == "") {
alert("Name must be filled out"); return;  }}

Try submitting the form without a value in txt box.

Case 1 (return) : it will show the alert but won't restrict submission. Case 2(return true) : same as above. Case 3 (return false) : finally it will restrict the submission. First to behaves like similar because return; will return undefined which is anything but not false.

Answer:6

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