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Please enable JavaScript in your browser settings or update your browser.Challenge: Variable Operations | Basic Operations
Introduction to JavaScript
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Introduction to JavaScript

Introduction to JavaScript

1. Basic Concepts
About JavaScriptSyntaxChallenge: Console OutputCommentsChallenge: Single-line CommentChallenge: Multi-line Comment
2. Variables and Data Types
VariablesChallenge: Defining the VariableconstData Types OverviewnullArrayArray MethodsChallenge: Array Operations
3. Basic Operations
AssignmentMathematical OperationsOperations with AssignmentIncrement and DecrementChallenge: Variable OperationsComparison OperationsLogical OperationsChallenge: Comparing VariablesString ConcatenationChallenge: Sentence Building
4. Conditional Statements
ifelseelse ifChallenge: Determining Size
5. Loops
whiledo whileChallenge: Printing Numbers from 5 to 9forChallenge: TigersbreakcontinueChallenge: Stopping and Skipping
6. Functions
What is a Function?DefinitionChallenge: My NameArgumentsreturnChallenge: SumSummary

bookChallenge: Variable Operations

Task

  1. Create the variable num.
  2. Assign the value 29 to the variable num.
  3. Increase the num variable by 99.
  4. Decrease the num variable by 23.

              
123456789

            
let num;
num ___ 29;
console.log(num);

num ___ 99;
console.log(num);

num ___ 23;
console.log(num);
copy

The output should be:

  1. Assign values to the variable using the assignment operator (=).
  2. Use arithmetic operators to perform calculations on the variable (+= and -=).

              
123456789

            
let num;
num = 29;
console.log(num);

num += 99;
console.log(num);

num -= 23;
console.log(num);
copy

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Seção 3. Capítulo 5
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