Learn Returning 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

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

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");

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Thanks for your feedback!

Section 4. Chapter 9

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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

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

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");

Everything was clear?

Thanks for your feedback!

Section 4. Chapter 9

Returning Data from Functions

General Syntax

How It Works?

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`?

Awesome!

Returning Data from Functions

General Syntax

How It Works?

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`?

Returning Data from Functions

General Syntax

How It Works?

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?

Awesome!

Returning Data from Functions

General Syntax

How It Works?

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?

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

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