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Introduction to JavaScript
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Course Content

Introduction to JavaScript

Introduction to JavaScript

1. JavaScript Fundamentals
About JavaScriptUnderstanding JavaScript SyntaxChallenge: Console Output in JavaScriptUsing Comments to Document CodeChallenge: Write a Single-Line CommentChallenge: Write a Multi-Line Comment
2. Variables and Data Types in JavaScript
Understanding Variables in JavaScriptChallenge: Define the VariableUsing const for ConstantsExploring JavaScript Data TypesWorking with null in JavaScriptIntroduction to ArraysArray Methods and ManipulationChallenge: Perform Array Operations
3. Performing Operations in JavaScript
Understanding Assignment OperatorsMathematical Operations in JavaScriptAssignment Operators in JavaScriptIncrement and Decrement OperatorsChallenge: Variable Operations PracticeComparison Operators in JavaScriptLogical Operators ExplainedChallenge: Compare Variables in JavaScriptConcatenating Strings in JavaScriptChallenge: Build Sentences with JavaScript
4. Controlling Program Flow with Conditional Statements
Mastering if Statements in JavaScriptUsing else for Alternative OutcomesApplying else if for Multiple ConditionsChallenge: Determine Sizes with Conditionals
5. Looping Through Data in JavaScript
Understanding the while Loop in JavaScriptUsing the do while Loop for IterationChallenge: Print Numbers from 5 to 9Mastering the for Loop in JavaScriptChallenge: Console Tigers with LoopsBreaking Out of Loops with breakSkipping Iterations with continueChallenge: Stop and Skip in Loops
6. Functions in JavaScript
What Are Functions in JavaScript?Defining Functions in JavaScriptChallenge: Write a Function – My NameUsing Function Arguments EffectivelyReturning Values from FunctionsChallenge: Create a Sum FunctionCourse Summary & Next Steps

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Defining Functions in JavaScript

To create a new function, use the function keyword. Provide a name for the function and define any arguments it should accept:

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The structure of a function definition includes:

  • The function keyword;
  • The function name, typically in camelCase like variables;
  • Arguments enclosed in parentheses ();
  • A code block within curly brackets {}.

Arguments

Functions have their own data storage space. Arguments are values passed to a function, which the function uses as variables. These arguments cease to exist when the function finishes executing.

To define arguments, assign a name to each one:

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If a function accepts multiple arguments, separate them with commas (,).

Note

Arguments are used like variables inside the function's code block.

Function calling

To use a function, call it using parentheses () and provide the necessary arguments if the function expects any:


              
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// Function Definition
function func(arg) {
  console.log("Argument received:", arg);
  console.log("Argument type:", typeof arg);
}

// Function Calling
func(1);
func(2521);
func("Rabbit");
func(true);
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question mark

Which of the following correctly defines a function that takes two arguments?

Select the correct answer

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SectionΒ 6. ChapterΒ 2
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