69 lines
1.5 KiB
Markdown
69 lines
1.5 KiB
Markdown
---
|
|
id: bd7123c9c452eddfaeb5bdef
|
|
title: Use Bracket Notation to Find the Nth-to-Last Character in a String
|
|
challengeType: 1
|
|
videoUrl: 'https://scrimba.com/c/cw4vkh9'
|
|
forumTopicId: 18344
|
|
dashedName: use-bracket-notation-to-find-the-nth-to-last-character-in-a-string
|
|
---
|
|
|
|
# --description--
|
|
|
|
You can use the same principle we just used to retrieve the last character in a string to retrieve the Nth-to-last character.
|
|
|
|
For example, you can get the value of the third-to-last letter of the `const firstName = "Augusta"` string by using `firstName[firstName.length - 3]`
|
|
|
|
Example:
|
|
|
|
```js
|
|
const firstName = "Augusta";
|
|
const thirdToLastLetter = firstName[firstName.length - 3];
|
|
```
|
|
|
|
`thirdToLastLetter` would have a value of the string `s`.
|
|
|
|
# --instructions--
|
|
|
|
Use <dfn>bracket notation</dfn> to find the second-to-last character in the `lastName` string.
|
|
|
|
**Hint:** Try looking at the example above if you get stuck.
|
|
|
|
# --hints--
|
|
|
|
`secondToLastLetterOfLastName` should be the letter `c`.
|
|
|
|
```js
|
|
assert(secondToLastLetterOfLastName === 'c');
|
|
```
|
|
|
|
You should use `.length` to get the second last letter.
|
|
|
|
```js
|
|
assert(code.match(/\.length/g).length > 0);
|
|
```
|
|
|
|
# --seed--
|
|
|
|
## --after-user-code--
|
|
|
|
```js
|
|
(function(v){return v;})(secondToLastLetterOfLastName);
|
|
```
|
|
|
|
## --seed-contents--
|
|
|
|
```js
|
|
// Setup
|
|
const lastName = "Lovelace";
|
|
|
|
// Only change code below this line
|
|
const secondToLastLetterOfLastName = lastName; // Change this line
|
|
```
|
|
|
|
# --solutions--
|
|
|
|
```js
|
|
const lastName = "Lovelace";
|
|
const secondToLastLetterOfLastName = lastName[lastName.length - 2];
|
|
```
|