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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

book
Breaking Out of Loops with break

The break keyword is a loop terminator, allowing you to exit a loop prematurely.

Example 1: Stopping an Infinite Loop


              
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let i = 1;

while (true) {
  console.log("Iteration", i);
  i++;
  if (i > 5) {
    break;
  }
}
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In this example, the break keyword stops the infinite while loop when i becomes equal to 6, after the i++ operation.

Example 2: Breaking a for Loop


              
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let a = 0;

for (let i = 0; i < 10; i++) {
  a += i;
  console.log("a =", a);
  if (i > 3) {
    break;
  }
}
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Here, the variable a is incremented by i during each iteration (0 + 1 + 2 + 3 + 4) until i becomes equal to 4. At that point, the break statement is triggered.

i = 0a = 0 + 0
i = 1a = 0 + 1
i = 2a = 1 + 2
i = 3a = 3 + 3
i = 4a = 6 + 4, break

Example 3: Breaking a while Loop Immediately


              
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while (true) {
  console.log("Iteration start");
  break;
  console.log("Iteration end"); // This line will not be executed
}

console.log("Loop was ended");
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In this example, the break statement inside the while loop immediately terminates the loop, preventing any code below it from executing within the same block.

Note

Remember that the break statement is a powerful tool for controlling the flow of your loops, allowing you to exit them when specific conditions are met.

question mark

What will be printed to the console by the following code?

Select the correct answer

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SectionΒ 5. ChapterΒ 6
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