# Learn Functional Programming by Building a Spreadsheet - Step 101

### Tell us what’s happening:

Im not really sure what its asking for. I did the best I could and looked for other solutions.

### Your code so far

``````<!-- file: index.html -->

``````
``````/* file: styles.css */

``````
``````/* file: script.js */
// User Editable Region

const spreadsheetFunctions = {
sum,
average,
median,
even: nums => nums.filter(isEven),
someeven: nums => nums.some(isEven),
everyeven: nums => nums.every(nums => nums === isEven(nums)),
firsttwo: nums => nums.slice(0, 2),
lasttwo: nums => nums.slice(-2),
has2: nums => nums.includes(2),
increment: nums => nums.map(num => num + 1),
}

// User Editable Region
``````

### Your browser information:

User Agent is: `Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.5 Safari/605.1.15`

### Challenge Information:

Learn Functional Programming by Building a Spreadsheet - Step 101

The instruction asked us to add an `everyeven` property, and this property is an arrow function, just like the `has2` or `increment` property you did before in the previous step:

But in the body of the arrow function,
instead of using ` nums.includes(2)` to check if the array has the number `2` or not, like in the `has2` property,
we need to use the `.every()` method to check whether all array elements are even.

About how to use `.every()` method, you can check the given example in the instruction as a reference:

An example of a `.every()` method call to check if all elements in the array are uppercase letters:

``````const arr = ["A", "b", "C"];
arr.every(letter => letter === letter.toUpperCase());
``````

To check a number is even or not, you can check if `num % 2` is equal `0` or not.