String Manipulation

Definition

In JS, strings are immutable. Operations like `slice()`, `substring()`, or `replace()` return entirely new strings, meaning heavy string concatenation inside loops can lead to O(N^2) time complexity. Using an array and `.join('')` is often faster.

Explain Like I'm New

You can't change a single letter in a word. You have to write the entire word out again on a new piece of paper with the new letter.

Interactive Coding Challenges

Write a function to implement the core logic of String Manipulation.

Solution Code

Console output will appear here...

This is the most straightforward brute-force or fundamental approach.