PourEliise.js

function keepNumbers(mixedarray){
    
    //create empty array to store the numbers in
    let numberarray = [];
    
    //for each element in the array call the anonymous function...
    mixedarray.forEach(
        //... right here
        function(element) {
            //check if the element type is "number"
            if(typeof(element) == "number"){
                //if it is, add it to the number array
                numberarray[numberarray.length] = element;
            }//otherwise do nothing
        }
    );
    //return the array that just contains numbers
    return numberarray;
}

//function is beeing called with a mixed element array
keepNumbers(["one", 4, 22, "jdsljf", [2]]);