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Return

Part of the Fundamentals section of Coddy's JavaScript journey — lesson 47 of 77.

The return statement in a function is used to specify the value or values that the function should produce as its output.

For example, the following function will output 100:

function functionName() {
	return 100;
}

To pass the value to a variable, write:

let number = functionName();

Now the number variable will hold 100 because this is what the function returned.

challenge icon

Challenge

Easy

Create a function called square that takes a single parameter n and returns its square. Then, call the function with the input value (given) and store the result in a variable called result. Finally, print the value of result.

Cheat sheet

The return statement specifies the value a function produces as output:

function functionName() {
	return 100;
}

To capture the returned value in a variable:

let number = functionName();

Try it yourself

let num = parseInt(inp); // Don't change this line
// Type your code below
quiz iconTest yourself

This lesson includes a short quiz. Start the lesson to answer it and track your progress.

All lessons in Fundamentals

1Introduction

The LanguageHello World!CommentsCode Structure

4Operators Part 2

Logical Operators Part 1Logical Operators Part 2Recap - Simple LogicLogical Operators Part 3Type Coercion

7Bill Split Calculator

Welcome MessageCalculating The Tip And TotalProject lessonSplitting The BillProject lessonFormatted OutputProject lesson

10FizzBuzz with a Twist

Game OverviewThe FizzBuzz FunctionProject lessonLooping The NumbersProject lessonAdding The TwistProject lesson

13Grocery List Tracker

Project OverviewAdd ItemProject lessonRemove ItemProject lessonView ListProject lesson

2Variables

NumbersStringBooleanNaming ConventionsEmpty VariablesRecap - Initialize VariablesConstants

5Decision Making

If StatementIf - ElseRecap - Simple CalculatorNested If - ElseSwitch Statement

8Loops

For LoopWhile LoopBreakContinueRecap - FactorialDo While LoopNested Loop

11Arrays Part 1

Declaring an ArrayAccessing Array ElementsModifying ArraysArray Methods Part 1Array Methods Part 2Recap - Array Processor

14Final Challenges

Number PyramidDouble The OddsWhat To Buy

3Operators Part 1

Arithmetic OperatorsModulo OperatorArithmetic ShortcutsComparison OperatorsStrict vs Loose EqualityRecap - Simple Math

6Basic IO

OutputOutput with VariablesType Conversion - Part 1Type Conversion - Part 2Recap - Till 120Recap - True or False

9Functions

Declare a FunctionArgumentsReturnRecap - Sigma FunctionFunction ExpressionDefault ParametersArrow FunctionsRecap - Validation Function

12Arrays Part 2

Iterating Over ArraysThe forEach Methodfor...of LoopRecap - P CounterArray SlicingArray Methods Part 3Array Methods Part 4Membership Testing