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

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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.

 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.

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.

newArr.push(arr[i]);

• Once that entire subarray is added to newArr the loop continue with the next element.

Solution:

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));