Basic Data Structures - Iterate Through All an Array's Items Using For Loops

JavaScript
1

Tell us what’s happening:
Describe your issue in detail here.

  **Your code so far**

function filteredArray(arr, elem) {
let newArr = [];
// Only change code below this line

for (let i = 0; i < arr.length; i++) {
  if (arr[i].indexOf(elem) == -1) {
    newArr.push(arr[i]); 
  }
}

// Only change code above this line
return newArr;
}

console.log(filteredArray([["amy", "beth", "sam"], ["dave", "sean", "peter"]], "peter"));

  **Your browser information:**

User Agent is: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/104.0.0.0 Safari/537.36

Challenge: Basic Data Structures - Iterate Through All an Array’s Items Using For Loops

Link to the challenge:

3

actually there is no errors.
Can anyone explain me why this if statement is work(especially why it supposed to be == -1) , where is the logic.
thanks

4

If indexOf returns -1, then the value being searched for does not exist in the array. The if statement checks to see if the item is NOT in the array. If not, then it adds the sub array to newArr.

5

thank. I appreciate your job. have a nice day

6

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