The Math.ceil() function in JavaScript is used to round the number passed as parameter to its nearest integer in Upward direction of rounding i.e towards the greater value.

I know you didn't mention my English, but other than that I cannot thing of much more: basically you just need to do some currying to a filter function: filter1 parses numbers as explained in the description, given the initial array and integer as initializing parameters.

^_^

Let's try this: does working through the example test cases gives you a better insight than the one you might get trying to decypher my poor English?

You need to create a function that returns other functions, taking parameters to pre-set itself.

Aka "currying" (sorta of).