Iterate Through All an Array's Items Using For Loops (freecodecamp notes)

Original Question -> https://www.freecodecamp.org/learn/javascript-algorithms-and-data-structures/basic-data-structures/iterate-through-all-an-arrays-items-using-for-loops

Question

We have defined a function, filteredArray, which takes arr, a nested array, and elem as arguments, and returns a new array. elem represents an element that may or may not be present on one or more of the arrays nested within arr. Modify the function, using a for loop, to return a filtered version of the passed array such that any array nested within arr containing elem has been removed.

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

Things to know before attempting this question

1.How indexOf works ? The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
2.How to iterate with a for loop
3.How to use .push()

Answer

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; }