Is it Safe to Compare JavaScript Strings?

Let’s compare 2 strings str1 and str2:

const str1 = 'Hello!';
const str2 = 'Hello!';

str1 === str2; // => true

Because str1 and str2 have the same characters, these strings are equal.

Is it always the case that 2 strings looking the same are equal? Let’s try another example:

const str1 = 'café';
const str2 = 'café';

str1 === str2; // => false

While str1 and str2 look the same, the comparison str1 === str2 evaluates to false. How’s that possible?

Let’s detail into how to correctly compare strings in JavaScript. Before starting, I’m going to familiarize you with the terms of grapheme (a unit of writing) and combining character (specialized character that modify the look of a base character).

1. What’s a grapheme

Looking at the following string, what can you say about its content?

const str1 = 'café';

You can easily see that it has 4 letters: lowercase c, lowercase a, lowercase f, and lowercase e with acute.

The way a user thinks about a character as a unit of writing is named grapheme. The example string café contains 4 graphemes.

Here’s a formal definition of a grapheme:

Grapheme is a minimally distinctive unit of writing in the context of a particular writing system.

Ok, that’s all interesting, but how does it relate to the safe comparison of strings? Some graphemes can be rendered using different sequences of characters.

Particularly, there is a special set of characters named combining characters that modify the previous character to create new graphemes. Let’s detail combining characters.

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JavaScript Strings Tutorial

JavaScript Strings

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What is JavaScript - Stackfindover - Blog

Who invented JavaScript, how it works, as we have given information about Programming language in our previous article ( What is PHP ), but today we will talk about what is JavaScript, why JavaScript is used The Answers to all such questions and much other information about JavaScript, you are going to get here today. Hope this information will work for you.

Who invented JavaScript?

JavaScript language was invented by Brendan Eich in 1995. JavaScript is inspired by Java Programming Language. The first name of JavaScript was Mocha which was named by Marc Andreessen, Marc Andreessen is the founder of Netscape and in the same year Mocha was renamed LiveScript, and later in December 1995, it was renamed JavaScript which is still in trend.

What is JavaScript?

JavaScript is a client-side scripting language used with HTML (Hypertext Markup Language). JavaScript is an Interpreted / Oriented language called JS in programming language JavaScript code can be run on any normal web browser. To run the code of JavaScript, we have to enable JavaScript of Web Browser. But some web browsers already have JavaScript enabled.

Today almost all websites are using it as web technology, mind is that there is maximum scope in JavaScript in the coming time, so if you want to become a programmer, then you can be very beneficial to learn JavaScript.

JavaScript Hello World Program

In JavaScript, ‘document.write‘ is used to represent a string on a browser.

<script type="text/javascript">
	document.write("Hello World!");
</script>

How to comment JavaScript code?

• For single line comment in JavaScript we have to use // (double slashes)
• For multiple line comments we have to use / * – – * /

<script type="text/javascript">

//single line comment

/* document.write("Hello"); */

</script>

Advantages and Disadvantages of JavaScript

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The essential JavaScript concepts that you should understand

As a JavaScript developer of any level, you need to understand its foundational concepts and some of the new ideas that help us developing code. In this article, we are going to review 16 basic concepts. So without further ado, let’s get to it.

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Is it Safe to Compare JavaScript Strings?

Let’s compare 2 strings str1 and str2:

const str1 = 'Hello!';
const str2 = 'Hello!';

str1 === str2; // => true

Because str1 and str2 have the same characters, these strings are equal.

Is it always the case that 2 strings looking the same are equal? Let’s try another example:

const str1 = 'café';
const str2 = 'café';

str1 === str2; // => false

While str1 and str2 look the same, the comparison str1 === str2 evaluates to false. How’s that possible?

Let’s detail into how to correctly compare strings in JavaScript. Before starting, I’m going to familiarize you with the terms of grapheme (a unit of writing) and combining character (specialized character that modify the look of a base character).

1. What’s a grapheme

Looking at the following string, what can you say about its content?

const str1 = 'café';

You can easily see that it has 4 letters: lowercase c, lowercase a, lowercase f, and lowercase e with acute.

The way a user thinks about a character as a unit of writing is named grapheme. The example string café contains 4 graphemes.

Here’s a formal definition of a grapheme:

Grapheme is a minimally distinctive unit of writing in the context of a particular writing system.

Ok, that’s all interesting, but how does it relate to the safe comparison of strings? Some graphemes can be rendered using different sequences of characters.

Particularly, there is a special set of characters named combining characters that modify the previous character to create new graphemes. Let’s detail combining characters.

#javascript #equality #string #programming