freeCodeCamp/guide/english/certifications/javascript-algorithms-and-data-structures/basic-data-structures/iterate-through-all-an-arrays-items-using-for-loops/index.md

---
title: Iterate Through All an Array's Items Using For Loops
---
# Iterate Through All an Array's Items Using For Loops

### Hint 1

- A nested `for` loop must be used to search through every element in the array.

```javascript
for (let i = 0; i < arr.length; i++) {}
```

### Hint 2
- Every element of the array must then be compared to the `elem` parameter passed through the `filteredArray()` function.
```javascript
if (arr[i].indexOf(elem) == -1) {
}
```
### Hint 3
- If a match is NOT found then `newArr` have that entire subarray added. The `push()` function is very useful here. 
```javascript
newArr.push(arr[i]);
```
- Once that entire subarray is added to `newArr` the loop continue with the next element.


---
## Solutions
<details><summary>Solution 1 (Click to Show/Hide)</summary>

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

  for (let i = 0; i < arr.length; i++) {
    if (arr[i].indexOf(elem) == -1) {
      //Checks every parameter for the element and if is NOT there continues the code
      newArr.push(arr[i]); //Inserts the element of the array in the new filtered array
    }
  }

  // change code above this line
  return newArr;
}
// change code here to test different cases:
console.log(filteredArray([[3, 2, 3], [1, 6, 3], [3, 13, 26], [19, 3, 9]], 3));
```
</details>