Compare Two JavaScript Strings, Ignoring Case

Compare Two JavaScript Strings, Ignoring Case – onlinecode

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Comparing two strings in JavaScript is easy: just use ===. But what
if you want to treat uppercase and lowercase letters as equal, so Bill@Microsoft.com is equivalent to bill@microsoft.com?

The most basic way to do case insensitive string comparison in JavaScript is using either the toLowerCase() or toUpperCase() method to make sure both strings are either all lowercase or all uppercase.

const str1 = 'Bill@microsoft.com';
const str2 = 'bill@microsoft.com';

str1 === str2; // false
str1.toLowerCase() === str2.toLowerCase(); // true

Using `localeCompare()`

JavaScript’s String#localeCompare() method gives you more fine-grained control over string comparison. For example, you can also compare two strings ignoring diacritics. Below is how you can do case-insensitive string comparison using localeCompare():

const str1 = 'Bill@microsoft.com';
const str2 = 'bill@microsoft.com';

str1 === str2; // false

// 0, means these two strings are equal according to 'localeCompare()'
str1.localeCompare(str2, undefined, { sensitivity: 'accent' });

The localeCompare() function is particularly useful if you want to sort an array of strings, ignoring case:

const strings = ['Alpha', 'Zeta', 'alpha', 'zeta'];

strings.sort((str1, str2) => str1.localeCompare(str2, undefined, { sensitivity: 'accent' }));

// Case insensitive sorting: ['Alpha', 'alpha', 'Zeta', 'zeta']
strings;

Don’t Use Regular Expressions

You may be tempted to compare two strings using regular expressions and JavaScript regexp’s i flag.

const str1 = 'Bill@microsoft.com';
const str2 = 'bill@microsoft.com';

new RegExp('^' + str1 + '$', 'i').test(str2); // true

However, using this approach, you need to be careful to escape special regular expression characters. For example, the below comparison fails, whereas it would succeed using toLowerCase() or localeCompare().

const str1 = '[hello]';
const str2 = '[Hello]';

new RegExp('^' + str1 + '$', 'i').test(str2); // false

You’re better off using toLowerCase() or localeCompare() than using a regular expression.

JavaScript Fundamentals

JavaScript is a programming language that is used to create interactive web pages. It is a client-side scripting language, which means that it runs on the user’s browser. JavaScript can be used to add animation, interactivity, and functionality to web pages.

Here are some of the fundamentals of JavaScript:

Variables: Variables are used to store data. They are declared using the var keyword.
Data types: JavaScript has a variety of data types, including strings, numbers, booleans, objects, and arrays.
Operators: Operators are used to perform operations on data.
Control flow statements: Control flow statements allow you to control the order in which your code is executed.
Functions: Functions are blocks of code that can be reused.
Objects: Objects are used to store data in key-value pairs.
Arrays: Arrays are used to store data in a sequential order.
Events and event handlers: Events are notifications that are sent by the browser when something happens, such as when the user clicks on an element or moves the mouse over an element. Event handlers are functions that are called in response to an event.
DOM manipulation: The Document Object Model (DOM) is a tree-like structure that represents the elements of a web page. JavaScript can be used to manipulate the DOM to change the appearance or behavior of a web page.

These are just some of the fundamentals of JavaScript. There are many other concepts that you can learn as you continue to develop your skills.

Here are some resources that you can use to learn more about JavaScript:

Mozilla Developer Network (MDN): The MDN is a great resource for learning about JavaScript. It has a comprehensive reference guide, tutorials, and articles on a wide range of topics.
W3Schools: W3Schools is another great resource for learning about JavaScript. It has interactive tutorials and quizzes that can help you learn the basics of the language.
JavaScript.info: JavaScript.info is a website that provides in-depth tutorials on JavaScript. It also has a forum where you can ask questions and get help from other JavaScript developers.

I hope this helps!

Here are some additional tips for learning JavaScript:

Start with the basics: Before you start trying to build complex applications, it’s important to learn the basics of JavaScript. This includes things like variables, data types, operators, and control flow statements.
Practice regularly: The best way to learn JavaScript is to practice regularly. Try to find some time each day to work on JavaScript projects.
Get help from others: If you get stuck, don’t be afraid to ask for help from others. There are many online forums and communities where you can get help from other JavaScript developers.

With a little practice, you’ll be able to learn JavaScript and start building amazing web applications.

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