Great solution! Is this considered better practice than using the Number.isInteger() javascript function? Perhaps it's faster?

good

Hold on! I don't even understand the quetion. 😏

Can anyone help me?

very clear and readable solution // my solution was different: (

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter

The filter callback function does not work like you think. It does not return a value, but returns a boolean which tells if the value should be kept or not in the filtered array.

can someone explain to me how the filter function is returning the keys instead of the value in the cache object? to me it seems like its going to return the values (count) rather than the actual keys.

the object looks like this:
cache { 20: 1, 37: 1, 21: 1 }

and what we are returning, looks like the value:
return intCount[number] <= x;

when i console.log(intCount[number]), i am getting the value and not the key. so how is the filter function returning the key?

yeah i am not sure what this kata is asking for. imo, need more context.