Using Functions

Why Use Functions?

Repeating code makes programs long and hard to maintain. Functions let you group commands into a reusable block, reducing repetition and making your code cleaner.

How to call Functions?

To call a function, simply use its name followed by parentheses, placing any required arguments inside those parentheses.

In the example below, the greet function is called on line 5 by adding parentheses to its name and passing "Alice" as the name argument.

A Simple Function Example


              12345
            
function greet(name) {
    console.log("Hello, " + name + "!");
}

greet("Alice");

Here’s what happens when you call greet("Alice"):

JavaScript looks for the function named greet.
It passes the string "Alice" as the argument for the parameter name.
Inside the function, the console.log statement concatenates "Hello, ", the value "Alice", and "!" to create the full greeting.
The final message "Hello, Alice!" is then printed to the console.

Tehtävä

Swipe to start coding

Ratkaisu

Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 2. Luku 1

ninja.js

index.html

preset.js

Using Functions

Why Use Functions?

Repeating code makes programs long and hard to maintain. Functions let you group commands into a reusable block, reducing repetition and making your code cleaner.

How to call Functions?

To call a function, simply use its name followed by parentheses, placing any required arguments inside those parentheses.

In the example below, the greet function is called on line 5 by adding parentheses to its name and passing "Alice" as the name argument.

A Simple Function Example


              12345
            
function greet(name) {
    console.log("Hello, " + name + "!");
}

greet("Alice");

Here’s what happens when you call greet("Alice"):

JavaScript looks for the function named greet.
It passes the string "Alice" as the argument for the parameter name.
Inside the function, the console.log statement concatenates "Hello, ", the value "Alice", and "!" to create the full greeting.
The final message "Hello, Alice!" is then printed to the console.

Tehtävä

Swipe to start coding

Ratkaisu

Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista

Oliko kaikki selvää?

Kiitos palautteestasi!

Osio 2. Luku 1

Vaihda työpöytään todellista harjoitusta vartenJatka siitä, missä olet käyttämällä jotakin alla olevista vaihtoehdoista