I don't know what it's called but I need help with it

So basically {stuff:0,stuff2:1,} is called an object and there basically what you CDO people know as sprites.
so if I had
var things = {
thing1: 10,
thing2: 20,
};
then I could say
things.thing1 which would be 10

in your case you have an array with a bunch of objects inside of it
so:

var acheivements = [
{
acheivement:'yey',
how:'do yey',
unlocked:false,
},
{
acheivement:'oops',
how:'do oops',
unlocked:false,
},
];

so to see if you have the first acheivement, yey, you would say
acheivements[0].unlocked
and it should be true or false(in this case false)

so now in case you didnt know a good way to go through every acheivement is

for(var i =0; i < acheivements.length; i++){
console.log('acheivement number '+i+' unlocked: '+acheivements[ i ].unlocked);
}

well hope this helps

Mellow no he doesnt care about noitif he just want points I love how he lies how he don't care about points but he likes his own post

yea you get it lol

INTERNECION Disrespectful??? nah bro went to far

Do you understand. it is 12:00 AM I am not dealing with this

Mellow
imma kill two birds with one stone on this
varrience probably has a better way but...

so anyways here how to for loop

for(var i = 0; i < 5; i++){
}

1. the var i = 0 means your making a variable called i which starts at 0
2. the i < 5 means the loop keeps repeating while i is less than 5
3. the i++ means i increases by one every time the loop repeats
   SO, in total, the loop repeats five times.
   now, to incorporate with arrays:
   for(var i = 0; i < array.length; i++){
}
   you'll notice its the same as before, except for part two where it now says i < array.length instead of i < 5
   this means that the for loop repeats array.length times, which means it repeats once for each object/achievement in the array

so now we can go through each achievement in the array by using array[i](the ith object in the array, and since i is changing once for each object in the array, we cover all the objects)
to sum it up you'd need something like this:
var numCompleted = 0;
for(var i = 0; i < achievements.length; i++){
if(achievements[i].completed === true){
numCompleted += 1;
}
}
again, hope this helps and im sure varrience has a better way of doing this but until then your welcome

Mellow possibly... not sure exactly what your trying to do, but i'll give 2 examples to try and answer what your trying to do, the

• first is to add a property that keeps track of that in the object that will update manually, unlike arrays objects don't have a .prototype.length attribute

• second is to encase multiple arrays of objects containing a Boolean on if they have been unlocked
  the two examples will be showcased below for those who want to learn

  var  obj = {
  pro: true,
  noob: false,
  achivements: 1
  total: 15
  }
  // we can then update it at any time a new achievement is unlocked
  var loser = true;
  if(loser && !obj.noob){obj.noob = true; achivements++}
  console.log("you have "+obj.total-obj.achivements+" left keep it up!")
  // the second way is below here which is basically what Ack did
  var accomp = [
  {title: "Ruiner", unlocked: false}
  {title: "Participation Award", unlocked: false}
  {title: "Secret Customer", unlocked: true}
  ];
  // to calculate how many achievements we have left we must iterate through the Array
  function accompLeft(){
  var left = accomp.length; // stores total achievements
  for(var i = 0; i < accomp.length; i++){
  if(accomp[i].unlocked){left--} // here we access an accomp [ index ] and a .property from that index 
  }
  return(left)
  } 

just stop f@cking arguing all the time goddammit
i am not going throught 48 posts >:(

oh hi Varrience