# Find the Odd Numbers in an Array using JavaScript Last updated: Jul 25, 2022

## Find the Odd Numbers in an Array#

To find the odd numbers in an array:

1. Use the `filter()` method to iterate over the array.
2. Check if each number has a remainder when divided by 2.
3. The `filter` method will return a new array containing only the odd numbers.
index.js
```Copied!```const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];

const odds = arr.filter(number => {
return number % 2 !== 0;
});

console.log(odds); // 👉️ [1, 3, 5, 7, 9]
``````

The function we passed to the Array.filter method gets called with each element in the array.

If the function returns a truthy value, the element is included in the new array the `filter` method returns.

On each iteration, we use the modulo (%) operator to check if the number has a remainder when divided by `2`.

index.js
```Copied!```console.log(10 % 2); // 👉️ 0
console.log(11 % 2); // 👉️ 1
``````

If there is a remainder, then the number is odd.

Only `odd` numbers meet the condition and get added to the new array.

An alternative approach is to use the Array.forEach method.

## Find the Odd Numbers in an Array using forEach()#

To find the odd numbers in an array:

1. Declare a new variable and set it to an empty array.
2. Use the `forEach` method to iterate over the array
3. Check if each number has a remainder when divided by 2.
4. If there is a remainder, push the number into the odd numbers array.
index.js
```Copied!```const arr = [1, 2, 3, 4, 5, 6, 7, 8, 9];

const odds = [];

arr.forEach(number => {
if (number % 2 !== 0) {
odds.push(number);
}
});

console.log(odds); // 👉️ [1, 3, 5, 7, 9]
``````

The function we passed to the `forEach()` method gets called with each element in the array.

We check if each number has a remainder when divided by `2` and push the odd numbers into the new array.

Once the `forEach` method has iterated over the entire array, the `odds` variable will contain all odd numbers from the original array.

Which approach you pick is a matter of personal preference. I'd go with the `filter()` method as it helps us avoid declaring an intermediary variable.