🔤 String Problems

Welcome to the String section of JDCodebase!

Strings are sequences of characters used in nearly every coding task. They are immutable in JavaScript, meaning any operation on a string returns a new one. Mastering string manipulation is key for interviews and daily coding.

📚 Common String Methods in JavaScript

str.length — returns the number of characters
str.charAt(i) or str[i] — access character at index
str.toLowerCase() / toUpperCase() — case conversion
str.includes(sub) — check for substring
str.indexOf(char) — find first index of a character
str.split(" ") — convert string into an array of words
str.trim() — remove whitespace from both ends
str.replace(a, b) — replace substring
str.slice(start, end) — extract substring by index
str.substring(start, end) — similar to slice, works without negatives

🧠 You'll Learn

Character frequency and counting logic
String reversal, palindrome checks, and substrings
Two-pointer techniques on strings

🔤 String Problems

📚 Common String Methods in JavaScript

🧠 You'll Learn

📝 Problems List