A function that takes an array as an argument and extracts all the strings of the array and puts them into a new array:

Ihave to write a function that takes an array as an argument and extracts all the strings of the array and puts them into a new array:

//======================  EXAMPLE  ========================
isString([3,55,66,"hello"])
["hello"] // <======  EXPECTED OUTPUT
isString([3,55,66,"hello","beer",12,{},[],()=>{},"[]"])
["hello","beer","[]"]  // <======  EXPECTED OUTPUT
//=========================================================

I wrote this:

function isString(arr){
    if(typeof arr[i] === 'string'){
     arr2.push(arr[i]);
 }
}

But I get undefined I don’t know why.

Answer

function isString(arr){
        var arr2 = [];
        arr.forEach(el => {
            if(typeof el === 'string'){
             arr2.push(el);
            }
          });
          return arr2;
        }
    console.log(isString([3,55,66,"hello","beer",12,{},[],()=>{},"[]"]))