*Intermediate Algorithm Scripting: Steamroller

JavaScript
1

Tell us what’s happening:
How may i set to split it with double quotes? I have to finish 3 tasks of the challenge, but I do not know how to set the double quotes. And what may I do in this casesteamrollArray([1, {}, [3, [[4]]]]) should return [1, {}, 3, 4] .?

Your code so far


function steamrollArray(arr) {


console.log(arr.join("").split(""))

let b = arr.join().replace(/,/g,"")*1

var digits = b.toString().split('');

var realDigits = digits.map(Number)

console.log(realDigits);



//return realDigits



}



steamrollArray([[["a"]], [["b"]]])

Your browser information:

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.138 Safari/537.36.

Challenge: Steamroller

Link to the challenge:

2

What you have is undefined behavior. You cannot use JavaScript like that and expect to get consistent results.

1 Like
3

This challenge can be solved by turning the array into a string and manipulating that string, but it’s really not the way that it’s intended to be solved.

1 Like
4

What may I do in case of letters and {}?

function steamrollArray(arr) {

 let a=arr.join()

let b=[]

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

                 

if(a[i]==1||a[i]==2||a[i]==3||a[i]==4||a[i]=="a"||a[i]=="b"){

     b.push(a[i]*1)                

              }   

          

         }

    return b;

}

steamrollArray([1, [2], [3, [[4]]]]);
5

How may i convert everything into string to use join? or what way do you suggest for solving it?

6

I’d use recursion, personally. It’s more natural than regex, to me.

1 Like
7

What can I try? I was trying to use strings. What would you suggest to do recursion?

8

You have an array. I’d leave it as an array. Then you can steamroller each element of the main array if they are themselves arrays.

1 Like
9

I really suggest solving the problem the way they you are intended to.

1 Like
10

function steamrollArray(arr) {
hoy may I become {} in a number? I am getting that in my array but as a string.

let b=[];

let a=JSON.stringify(arr)

let replacedArr=(a.replace(/[\[\]']+/g,''))

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

        if(replacedArr[i]==1||replacedArr[i]==2||replacedArr[i]==3||replacedArr[i]==4  ){

                   b.push(replacedArr[i]*1)

             }else if(replacedArr[i]=="a"||replacedArr[i]=="b"){

                   b.push(replacedArr[i])

             }else if(replacedArr[i]=="{" ){

                      b.push(replacedArr[i]+"}") 

             }     

      }

                   console.log(b)

                   return b

}

steamrollArray([1, {}, [3, [[4]]]]);
11

Your solution is not going to work because you are trying to hard-code specific values. Your function needs to work for any array.

Converting the array to a string is NOT the intended way to solve this (or a particularly good one), but it can be done using regular expressions.

2 Likes
12

I am trying to make recursion, aber it is not working.

let newArr = [];
const steamrollArray = (arr) => {
  for (let x of arr) {
    if (Array.isArray(x)) {
      steamrollArray(x);
    } else {
      newArr.push(x);
    }
  }
};
13

You have the start of recursion but you aren’t using recursion. You steamroll x if it is an array, but you need to use that steamrolled version of x to update newArr.

Also, newArr should not be a global variable.

2 Likes
14

As Jeremy said, you shouldn’t have a global variable. You also aren’t returning anything from your steamrollArray or doing anything with the value that should be returned by steamrollArray(x).

2 Likes