I have a variable that I want the program to continuously check its value

Question

I have a variable that I want the program to continuously check its value. the code goes something like this:

var score = 1

if (player touches the star) 
{
    player moves to bottom of screen
score = score + 1
}

if (score == 2)
{
   a bunch of images.x = 1300
`your text`}

this is obviously not the real code (i use javascript with phaser library) but i hope that you get the idea

i tried changing the place in the code where if (score == 2) { a lot of images move off screen} but it did not work. I even put the places where the images .x properties were mentioned inside if (score > 2) if statements but it did not move the images no matter what. I think that the only way to fix this is to constantly check the score variable.

a very simmilar question was asked a few years ago on this website with the title JavaScript continuously check a variable but that only works for true or false variables it seems like — Bilal Siddiqui
– Bilal Siddiqui, Commented Apr 28, 2024 at 23:06

winner_joiner · Accepted Answer · 2024-04-30 04:25:52Z

0

The easiest way to check a variable multiple time is as James mentiond in the game loop, the update function.

var config = {
    type: Phaser.AUTO,
    width: 536,
    height: 183,
    scene: {
        create,
        update
    },
    // ...
}; 

function create () {
   // ...
}

function update () {
    //... this function is called 60 times per second
}
new Phaser.Game(config);

You just will have to becareful how to access the variables. Make the part of the object like this this.score = 2 or make the global variable. I would not recommend the later.

Update, based on comment:

document.body.style = 'margin:0;';

var config = {
    type: Phaser.AUTO,
    width: 536,
    height: 183,
    physics: {
        default: 'arcade',
        arcade: { gravity: { y: 100 }},
    },
    scene: {
        create,
    },
}; 

function create () {
    let score = 0;
    let label = this.add.text(10,10, 'Score: 0')
        .setScale(1.5)
        .setOrigin(0)
        .setStyle({fontStyle: 'bold', fontFamily: 'Arial'});

    let player = this.add.rectangle( 50, 10, 10, 10, 0xffffff );
    
    // adding a physics body to the GameObjects 
    this.physics.add.existing(player); 
    
    // create "Coins" GameObjects
    let coin1 = this.add.rectangle( 50, 50, 10, 10, 0xff0000 );
    let coin2 = this.add.rectangle( 50, 80, 10, 10, 0xff0000 );
    
    // adding a physics body to the GameObjects 
    this.physics.add.existing(coin1, true); 
    this.physics.add.existing(coin2, true); 
    
    // collider: callback function that checks if the player collides with coins
    // One could also use the function "overlap", if the player should not be slowed down, on collision
    this.physics.add.collider(player, [coin1, coin2], (p,c) =>{
        // remove coin
        c.destroy();
        // add score
        score += 2;
        // update label
        label.setText(`Score: ${score}`);
    });
}

new Phaser.Game(config);

<script src="//cdn.jsdelivr.net/npm/phaser/dist/phaser.min.js"></script>

edited Apr 30, 2024 at 4:25

answered Apr 29, 2024 at 4:16

winner_joiner

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2 Comments

Bilal Siddiqui Over a year ago

I understand that I must put this.score = 2 in the update function, but how would i put the function that is called when the player touches the star in the update function (it crashes when I do this).

winner_joiner Over a year ago

@BilalSiddiqui It depends always on your usecase since there are many ways to do things in phaser. I updated my answer with a new code. Here I'm using the collider function, this one is only called when to objects collide. I could have done it with the update function, but in this usecase like this it is easier. I hope this helps.

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