What's the reason behind JavaScript's Every method not functioning properly?

I'm struggling to understand why the array method 'every' is not functioning properly in my project (working on a roguelike dungeon crawler game).

Here's an example of the array of objects I am working with:

   { 
    x: newrm.x,
    y: newrm.y + 10,
    w: newrm.w,
    h: newrm.h,
    centerx: newrm.centerx, 
    centery: newrm.centery + 10
   }

My goal is to test whether every element in this new array passes a specific test (to avoid player collision with walls) using the Every method:

if (newdraw.every(isWithin)) {
    ctx2.clearRect(0, 0, width, height);
    this.setState({ dungeon: newdraw });
}
function isWithin(obj) {
  console.log('this is the obj and this is the player', obj, player);
  return obj.x < player.x + player.w && obj.x + obj.w > player.x && obj.y < player.y + player.h && obj.h + obj.y > player.y;
}

It appears that not all elements are being checked, as only two objects are showing up in the console log.

Any assistance would be greatly appreciated.

Thank you.

Answer №2

Below is a demonstration of the every() method in JavaScript:

var data = [{
    "name": "Look",
    "lastName": "Alike",
    "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="ec808383878d80858789ac8b818d8580c28f8381">[email protected]</a>"
  },
  {
    "name": "Matt",
    "lastName": "Kaddy",
    "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="2b46404a4f6b4c464a424705484446">[email protected]</a>"
  }
]

var newData = {
  "name": "Different",
  "lastName": "Person",
  "email": "<a href="/cdn-cgi/l/email-protection" class="__cf_email__" data-cfemail="e4888b8b8f85888d8f81a48389858d88ca878b89">[email protected]</a>"
}


data.every((x) => {
  if ( ( x.email.toLowerCase()) === ( newData.email.toLowerCase()) ) {
    console.log("The loop stops here because it returns false")
    return false;
  }
  // If it returns true, this code will execute
  console.log(x);
});

Answer №3

To begin, it is crucial to comprehend how conditions impact each method differently.

const numbers = [9, 5, 2, 6, -23, 6, 8, 1, 9, 2, 0].every((num) => {
  return num > 0;
});
console.log(numbers);

When using the Array.every method, we are basically asking if every element in the array is greater than 0. As soon as index 4 is reached with a value of -23, the cycle breaks and false is returned.

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