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JavaScript Essentials for Beginners - 1768407374405

bookReturning Data from Functions

We can return any kind of value from a function using a return statement.


              
123456

            
function sum(a, b) { 
  return a + b;
}

let result = sum(10, 15);
console.log(result); // Output: 25
copy

General Syntax

The general syntax of a return statement is

return <value>;

Where <value> is optional. If no value is provided, the function returns undefined:


              
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function exampleFunc() {
  console.log("In the Function");
  return;
}

let result = exampleFunc();
console.log("Return value if nothing is returned:", result); // Output: undefined
copy

How It Works?

The return statement stops the execution of the function, and returns to the point in code the function where it was called. Therefore, any code after return is ignored:


              
1234567891011

            
function exampleFunc() {
  console.log(1);
  console.log(2);
  return true; // Execution stops here
  console.log(4); // Ignored
  console.log(5); // Ignored
}

console.log("Before Function Call");
console.log(exampleFunc()); // Output: true
console.log("After Function Call");
copy

1. What will be the output of the following code?

2. What happens if a function has a return statement with no value?

3. What will be the output of the following code?

4. In the following code, what will be the value of result?

question mark

What will be the output of the following code?

Select the correct answer

question mark

What happens if a function has a return statement with no value?

Select the correct answer

question mark

What will be the output of the following code?

Select the correct answer

question mark

In the following code, what will be the value of result?

Select the correct answer

Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

Sectie 1. Hoofdstuk 53

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bookReturning Data from Functions

Veeg om het menu te tonen

We can return any kind of value from a function using a return statement.


              
123456

            
function sum(a, b) { 
  return a + b;
}

let result = sum(10, 15);
console.log(result); // Output: 25
copy

General Syntax

The general syntax of a return statement is

return <value>;

Where <value> is optional. If no value is provided, the function returns undefined:


              
1234567

            
function exampleFunc() {
  console.log("In the Function");
  return;
}

let result = exampleFunc();
console.log("Return value if nothing is returned:", result); // Output: undefined
copy

How It Works?

The return statement stops the execution of the function, and returns to the point in code the function where it was called. Therefore, any code after return is ignored:


              
1234567891011

            
function exampleFunc() {
  console.log(1);
  console.log(2);
  return true; // Execution stops here
  console.log(4); // Ignored
  console.log(5); // Ignored
}

console.log("Before Function Call");
console.log(exampleFunc()); // Output: true
console.log("After Function Call");
copy

1. What will be the output of the following code?

2. What happens if a function has a return statement with no value?

3. What will be the output of the following code?

4. In the following code, what will be the value of result?

question mark

What will be the output of the following code?

Select the correct answer

question mark

What happens if a function has a return statement with no value?

Select the correct answer

question mark

What will be the output of the following code?

Select the correct answer

question mark

In the following code, what will be the value of result?

Select the correct answer

Was alles duidelijk?

Hoe kunnen we het verbeteren?

Bedankt voor je feedback!

Sectie 1. Hoofdstuk 53
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