Kursinnhold
Introduction to JavaScript
Introduction to JavaScript
1. Getting Started
First Javascript Console ApplicationChallenge: Showing some OutputChallenge: Outputing Multiple LinesDealing with NumbersChallenge: Working with NumbersChallenge: Calculating the Speed of a CarChallenge: Calculating Area of a TrapeziumOutputting Multiple ValuesChallenge: Consoling Meaningful OutputHow to Use Comments in Javascript?Challenge: Adding a CommentMulti-Line CommentsChallenge: Commenting out CodeWhat Is JavaScript anyway?
2. Manipulating Data
Storing DataChallenge: Declaring a VariableChallenge: Accessing Data From a VariableChallenge: Fixing Variable NamesChallenge: Reassigning a VariableConstantsChallenge: Declaring & Using ConstantsPerforming Arithmetic On VariablesChallenge: Making a Salary CalculatorChallenge: Adjusting Salary with a BonusExploring Primitive Data TypesChallenge: Declaring a Boolean ValueHow different Data Types InteractChallenge: Concatenating StringsChallenge: Creating User Profile & Activity Details
3. Conditional Statements
Comparison OperatorsChallenge: Checking Age EligibilityThe `if` StatementChallenge: Weather-Based Outfit RecommenderChallenge: Even or OddNested Conditional StatementsThe `else` ClauseChallenge: Improving Even or Odd CheckerChallenge: Temperature AdvisorThe `else if` ClauseChallenge: Grade Categorizer` AND` Logical OperatorChallenge: Checking if a Number is Even and PositiveOR Logical OperatorChallenge: Accessing Control System
4. Mastering Functions
What Are Functions?Challenge: Simple FunctionChallenge: Calculating the Speed of a CarScopesPassing Data into FunctionsChallenge: Fixing the Speed FunctionChallenge: Improving the Grade CategorizerTask: Defining a Compound FunctionReturning Data from FunctionsDefault ValuesChallenge: Email Auto-Responder with Default Parameters
5. Exploring Arrays
What Are Arrays?Challenge: Defining An ArrayChallenge: IndexingAdding Values to an ArrayChallenge: Pushing Elements to an ArrayRemoving Elements from an ArrayChallenge: Practicing `pop` & `shift`The `length` PropertyChallenge: Counting ElementsThe `includes` MethodChallenge: Searching for Animals in the Zoo
Constants
Definition
Constants are similar to variables however their value, as expressed by the name, is always constant or unchanged.
We can declare a constant using the const
keyword, and it's important to initialize it at the same point as well. Following is the syntax for constant declaration & initialization:
js
For example:
js
Changing the value of a constant results in an error:
js
The names of the constants follow the same naming rules as the variables.
1. What is a constant in JavaScript?
2. Which keyword is used to declare a constant in JavaScript?
3. What happens if you try to reassign a value to a constant?
4. Which of the following correctly declares and initializes a constant in a single statement?
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Seksjon 2. Kapittel 6