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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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Using else for Alternative Outcomes

While if statements execute code under specific conditions, they don't create true branching in your code. Instead, they guide the interpreter through different paths within your program.

The else Keyword

To introduce branching behavior, you can use the else keyword in combination with if to create conditional statements.

Consider this example:


              
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let a = 60;

if (a >= 100) {
  console.log("a is greater than or equal to 100");
} else {
  console.log("a is less than 100");
}
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In the example above, the condition a >= 100 evaluates to false, so the code block within the if statement is not executed. Instead, the code block within the else statement is executed because the if condition is false.

The syntax of the else statement is similar to that of the if statement, except it doesn't require a condition or parentheses ().

Note

When using an else statement, do not place the end-of-command (;) after the if code block ({}), as this will result in a SyntaxError. The if-else statement is considered a single command.

1. What will be the output?

2. What will be the output?

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What will be the output?

Select the correct answer

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What will be the output?

Select the correct answer

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Section 4. Chapter 2
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