collect-odds-pure-recursion.js

function collectOddValues(arr){
    let newArr = [];
    
    if(arr.length === 0) {
        return newArr;
    }
    if(arr[0] % 2 !== 0){
        newArr.push(arr[0]);
    }        
    newArr = newArr.concat(collectOddValues(arr.slice(1)));
    return newArr;
}
collectOddValues([1,2,3,4,5]);