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

id, title, challengeType, forumTopicId

id	title	challengeType	forumTopicId
a6e40f1041b06c996f7b2406	Finders Keepers	5	16016

--description--

Create a function that looks through an array arr and returns the first element in it that passes a 'truth test'. This means that given an element x, the 'truth test' is passed if func(x) is true. If no element passes the test, return undefined.

--hints--

findElement([1, 3, 5, 8, 9, 10], function(num) { return num % 2 === 0; }) should return 8.

assert.strictEqual(
  findElement([1, 3, 5, 8, 9, 10], function (num) {
    return num % 2 === 0;
  }),
  8
);

findElement([1, 3, 5, 9], function(num) { return num % 2 === 0; }) should return undefined.

assert.strictEqual(
  findElement([1, 3, 5, 9], function (num) {
    return num % 2 === 0;
  }),
  undefined
);

--seed--

--seed-contents--

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

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

--solutions--

function findElement(arr, func) {
  return arr.filter(func)[0];
}

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