freeCodeCamp/curriculum/challenges/en/02-javascript-algorithms-and-data-structures/basic-algorithm-scripting/finders-keepers.en.md

---
id: a6e40f1041b06c996f7b2406
title: Finders Keepers
isRequired: true
challengeType: 5
---

## Description
<section id='description'>
Create a function that looks through an array (first argument) and returns the first element in the array that passes a truth test (second argument). If no element passes the test, return undefined.
Remember to use <a href='http://forum.freecodecamp.org/t/how-to-get-help-when-you-are-stuck/19514' target='_blank'>Read-Search-Ask</a> if you get stuck. Try to pair program. Write your own code.
</section>

## Instructions
<section id='instructions'>

</section>

## Tests
<section id='tests'>

```yml
- text: '<code>findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; })</code> should return 8.'
  testString: 'assert.strictEqual(findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; }), 8, ''<code>findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; })</code> should return 8.'');'
- text: '<code>findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; })</code> should return undefined.'
  testString: 'assert.strictEqual(findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; }), undefined, ''<code>findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; })</code> should return undefined.'');'

```

</section>

## Challenge Seed
<section id='challengeSeed'>

<div id='js-seed'>

```js
function findElement(arr, func) {
  let num = 0;
  return num;
}

findElement([1, 2, 3, 4], num => num % 2 === 0);
```

</div>



</section>

## Solution
<section id='solution'>


```js
function findElement(arr, func) {
  let num;

  arr.some(e => {
    if (func(e)) {
      num = e;
      return true;
    }
  });

  return num;
}

findElement([1, 2, 3, 4], num => num % 2 === 0);

```

</section>