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Compare Two JavaScript Strings, Ignoring Case – onlinecode

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Compare Two JavaScript Strings, Ignoring Case – onlinecode

In this post, we will give you information about Compare Two JavaScript Strings, Ignoring Case – onlinecode. Here we will give you detail about Compare Two JavaScript Strings, Ignoring Case – onlinecode And how to use it also give you a demo for it if it is necessary.

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.

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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:

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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:

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I hope this helps!

Here are some additional tips for learning JavaScript:

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

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