|
| 1 | +# String Methods in JavaScript |
| 2 | + |
| 3 | +### charAt() |
| 4 | +```javascript |
| 5 | +const charAtIndex = "Hello".charAt(1); // Output: "e" |
| 6 | +``` |
| 7 | + |
| 8 | +### concat() |
| 9 | +```javascript |
| 10 | +const concatenated = "Hello".concat(" World"); // Output: "Hello World" |
| 11 | +``` |
| 12 | + |
| 13 | +### toUpperCase() |
| 14 | +```javascript |
| 15 | +const upperCaseString = "hello".toUpperCase(); // Output: "HELLO" |
| 16 | +``` |
| 17 | + |
| 18 | +### toLowerCase() |
| 19 | +```javascript |
| 20 | +const lowerCaseString = "HeLLo".toLowerCase(); // Output: "hello" |
| 21 | +``` |
| 22 | + |
| 23 | +### substring() |
| 24 | +```javascript |
| 25 | +const subString = "JavaScript".substring(4, 10); // Output: "Script" |
| 26 | +``` |
| 27 | + |
| 28 | +### replace() |
| 29 | +```javascript |
| 30 | +const replacedString = "Hello, name!".replace("name", "John"); // Output: "Hello, John!" |
| 31 | +``` |
| 32 | + |
| 33 | +### split() |
| 34 | +```javascript |
| 35 | +const splitArray = "apple,banana,grape".split(","); // Output: ["apple", "banana", "grape"] |
| 36 | +``` |
| 37 | + |
| 38 | +### indexOf() |
| 39 | +```javascript |
| 40 | +const index = "JavaScript".indexOf("Script"); // Output: 4 |
| 41 | +``` |
| 42 | + |
| 43 | +### endsWith() |
| 44 | +```javascript |
| 45 | +const endsWithWorld = "Hello, world".endsWith("world"); // Output: true |
| 46 | +``` |
| 47 | + |
| 48 | +### startsWith() |
| 49 | +```javascript |
| 50 | +const startsWithHello = "Hello, world".startsWith("Hello"); // Output: true |
| 51 | +``` |
| 52 | + |
| 53 | +### includes() |
| 54 | +```javascript |
| 55 | +const includesWorld = "Hello, world".includes("world"); // Output: true |
| 56 | +``` |
| 57 | + |
| 58 | +### trim() |
| 59 | +```javascript |
| 60 | +const trimmedString = " Hello, world ".trim(); // Output: "Hello, world" |
| 61 | +``` |
| 62 | + |
| 63 | +## Practice Questions |
| 64 | + |
| 65 | +- [Find the Index of the First Occurrence in a String](https://leetcode.com/problems/find-the-index-of-the-first-occurrence-in-a-string/) |
| 66 | +- [Reverse String](https://leetcode.com/problems/reverse-string) |
| 67 | +- [Valid Anagram](https://leetcode.com/problems/valid-anagram) |
| 68 | +- [Longest Common Prefix](https://leetcode.com/problems/longest-common-prefix) |
| 69 | +- [Merge Strings Alternately](https://leetcode.com/problems/merge-strings-alternately) |
| 70 | +- [Length of Last Word](https://leetcode.com/problems/length-of-last-word/) |
| 71 | +- [Valid Palindrome](https://leetcode.com/problems/valid-palindrome) |
| 72 | +- [String Compression](https://leetcode.com/problems/string-compression) |
| 73 | +- [Reverse Words in a String](https://leetcode.com/problems/reverse-words-in-a-string) |
| 74 | +- [Reverse Vowels of a String](https://leetcode.com/problems/reverse-vowels-of-a-string) |
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