freeCodeCamp/curriculum/challenges/english/02-javascript-algorithms-and-data-structures/basic-javascript/use-bracket-notation-to-find-the-first-character-in-a-string.english.md

id	title	challengeType	isHidden	videoUrl	forumTopicId
bd7123c9c549eddfaeb5bdef	Use Bracket Notation to Find the First Character in a String	1	false	https://scrimba.com/c/ca8JwhW	18341

Description

Bracket notation is a way to get a character at a specific index within a string. Most modern programming languages, like JavaScript, don't start counting at 1 like humans do. They start at 0. This is referred to as Zero-based indexing. For example, the character at index 0 in the word "Charles" is "C". So if var firstName = "Charles", you can get the value of the first letter of the string by using firstName[0].

Example:

var firstName = "Charles";
var firstLetter = firstName[0]; // firstLetter is "C"

Instructions

Use bracket notation to find the first character in the lastName variable and assign it to firstLetterOfLastName. Hint: Try looking at the example above if you get stuck.

Tests

tests:
  - text: The <code>firstLetterOfLastName</code> variable should have the value of <code>L</code>.
    testString: assert(firstLetterOfLastName === 'L');
  - text: You should use bracket notation.
    testString: assert(code.match(/firstLetterOfLastName\s*?=\s*?lastName\[.*?\]/));

Challenge Seed

// Setup
var firstLetterOfLastName = "";
var lastName = "Lovelace";

// Only change code below this line
firstLetterOfLastName = lastName; // Change this line

After Test

(function(v){return v;})(firstLetterOfLastName);

Solution

var firstLetterOfLastName = "";
var lastName = "Lovelace";

// Only change code below this line
firstLetterOfLastName = lastName[0];