wehub-resource-sync
dde272c4b8
i18n - Build Validation / Validate i18n Builds (24) (push) Has been cancelled
CI - Node.js / Lint (24) (push) Has been cancelled
CI - Node.js / Build (24) (push) Has been cancelled
CI - Node.js / Test (24) (push) Has been cancelled
CI - Node.js / Test - Upcoming Changes (24) (push) Has been cancelled
CI - Node.js / Test - i18n (italian, 24) (push) Has been cancelled
CI - Node.js / Test - i18n (portuguese, 24) (push) Has been cancelled
CD - Docker - GHCR Images / Build and Push Images (push) Has been cancelled
59 lines
1.1 KiB
Markdown
59 lines
1.1 KiB
Markdown
---
|
|
id: a6e40f1041b06c996f7b2406
|
|
title: Finders Keepers
|
|
challengeType: 1
|
|
forumTopicId: 16016
|
|
dashedName: finders-keepers
|
|
---
|
|
|
|
# --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`.
|
|
|
|
```js
|
|
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`.
|
|
|
|
```js
|
|
assert.strictEqual(
|
|
findElement([1, 3, 5, 9], function (num) {
|
|
return num % 2 === 0;
|
|
}),
|
|
undefined
|
|
);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
function findElement(arr, func) {
|
|
let num = 0;
|
|
return num;
|
|
}
|
|
|
|
findElement([1, 2, 3, 4], num => num % 2 === 0);
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
function findElement(arr, func) {
|
|
return arr.filter(func)[0];
|
|
}
|
|
|
|
findElement([1, 2, 3, 4], num => num % 2 === 0);
|
|
```
|