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Returning Values from Functions in JavaScript

Using return lets functions output a value you can use elsewhere instead of just logging it.

Defining a Function with `return`

function add(numberOne, numberTwo) {
  return (numberOne + numberTwo);
}

return sends the result back to the caller.
Parentheses around the expression are optional but group the operation.

Capturing the Returned Value

Assign the function call to a variable:

const result = add(3, 45);  
console.log(result); // 48

const resultTwo = add(12, 7);
console.log(resultTwo); // 19

The value returned by add() is stored in result or resultTwo.
You can then log, manipulate, or pass these values elsewhere.

Why Use `return`?

Flexibility: Use the output in calculations, conditions, or further function calls.
Reusability: Call the same function with different inputs and handle the outputs as needed.

function multiply(a, b) {
  const product = a * b;
  return product;
}

const area = multiply(5, 10);
console.log(`Area: ${area}`); // Area: 50

Summary

Use return inside a function to send back a value.
Capture returned values in variables for further use.
Makes functions more powerful and composable.

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Basic functions

Function Expressions

Return values from functions

JavaScript functions that use the `return` keyword to output values that can be utilized throughout your code. In this lesson, you'll learn how to define functions that return results, capture those values for further manipulation, and enhance the flexibility and reusability of your code.

3m 0s