Javascript:custom filter function to emulate array.filter

Write a custom function to which will emulate array.filter()

Code:

    let arr=[10,2,12,45,8,23];

    function customFilter(arr,callback){

        let result=[];

        for(let i=0;i<arr.length;i++){

            if(callback(arr[i],i,arr)){

                result.push(arr[i])

            }

        }

        return result;

    }

    function lessThan10(num,index,arr){

    if(num > 10){

        return true

    }else{

        return false;

    }

    }

    var filtered = customFilter(arr,lessThan10);

    console.log(filtered)

Output:

[ 12, 45, 23 ]