JavaScript Strings Guide
Strings represent text in JavaScript and are immutable sequences of UTF-16 code units. This guide covers all methods for manipulating, searching, and transforming string data. Because strings are immutable, every method that appears to modify a string actually returns a new string, leaving the original unchanged. Understanding string methods is essential for form validation, text processing, data parsing, and user interface formatting in any JavaScript application. The guide walks through Creating Strings, Searching & Extracting, Transforming Strings, Pattern Matching, Unicode & Locale, Modern String Features. Strings can be created with single quotes, double quotes, or template literals (backticks). Template literals support interpolation with `${expression}` and multiline strings without escape characters. Tagged template literals allow custom processing of template strings for use cases like syntax highlighting or internationalization. Strings can also be created from char codes with `String.fromCharCode()` or iterated into arrays of characters with the… Methods like `indexOf()`, `includes()`, `startsWith()`, `endsWith()` find substrings and return boolean or position. `slice()`, `substring()`, and `substr()` extract portions of a string. `slice()` is the recommended method because it supports negative indices and handles edge cases cleanly, while `substring()` swaps negative arguments to zero and `substr()` is deprecated. `indexOf(sub, from)` finds the first occurrence starting from an optional position, and…