Shubham Ankit

Shubham Ankit

1559011901

5 Ways to Convert a Value to String in JavaScript

If you’re following the Airbnb’s Style Guide, the preferred way is using “String()” 👍

It’s also the one I use because it’s the most explicit - making it easy for other people to follow the intention of your code 🤓

Remember the best code is not necessarily the most clever way, it’s the one that best communicates the understanding of your code to others 💯

const value = 12345;

// Concat Empty String
value + '';

// Template Strings
`${value}`;

// JSON.stringify
JSON.stringify(value);

// toString()
value.toString();

// String()
String(value);

// RESULT
// '12345'

Comparing the 5 ways

Alright, let’s test the 5 ways with different values. Here are the variables we’re going to test these against:

const string = "hello";
const number = 123;
const boolean = true;
const array = [1, "2", 3];
const object = {one: 1 };
const symbolValue = Symbol('123');
const undefinedValue = undefined;
const nullValue = null;

Concat Empty String

string + ''; // 'hello'
number + ''; // '123'
boolean + ''; // 'true'
array + ''; // '1,2,3'
object + ''; // '[object Object]'
undefinedValue + ''; // 'undefined'
nullValue + ''; // 'null'

// ⚠️
symbolValue + ''; // ❌ TypeError

From here, you can see that this method will throw an TypeError if the value is a Symbol. Otherwise, everything looks pretty good.

Template String

`${string}`; // 'hello'
`${number}`; // '123'
`${boolean}`; // 'true'
`${array}`; // '1,2,3'
`${object}`; // '[object Object]'
`${undefinedValue}`; // 'undefined'
`${nullValue}`; // 'null'

// ⚠️
`${symbolValue}`; // ❌ TypeError

The result of using Template String is essentially the same as Concat Empty String. Again, this might not be the ideal way when dealing with Symbol as it will throw a TypeError.

This is the TypeError if you’re curious: TypeError: Cannot convert a Symbol value to a string

JSON.stringify()

// ⚠️
JSON.stringify(string); // '"hello"'
JSON.stringify(number); // '123'
JSON.stringify(boolean); // 'true'
JSON.stringify(array); // '[1,"2",3]'
JSON.stringify(object); // '{"one":1}'
JSON.stringify(nullValue); // 'null'
JSON.stringify(symbolValue); // undefined
JSON.stringify(undefinedValue); // undefined

So you typically would NOT use JSON.stringify to convert a value to a string. And there’s really no coercion happening here. I mainly included this way to be complete. So you are aware of all the tools available to you. And then you can decide what tool to use and not to use depending on the situation 👍

One thing I want to point out because you might not catch it. When you use it on an actual string value, it will change it to a string with quotes.

You can read more about this in Kyle Simpson, “You Don’t Know JS series”:

JSON Stringification

Side note on the importance of knowing your fundamentals!

Yes, you may have noticed in my code notes, I frequently quote Kyle’s books. I honestly have learned a lot of it. Not coming from a computer science background, there is a lot of fundamentals concept I’m lacking. And his book has made me realize the importance of understanding the fundamentals. For those, who want to be a serious programmer, the way to level up is really TRULY understand the fundamentals. Without it, it’s very hard to level up. You end up guessing the problem. But if you know the fundamentals, you will understand the “why” of something. And knowing the “why” will help you better execute the “how”. Anyhoo, highly recommend this series for those trying to becoming a senior programmer!

toString()

string.toString(); // 'hello'
number.toString(); // '123'
boolean.toString(); // 'true'
array.toString(); // '1,2,3'
object.toString(); // '[object Object]'
symbolValue.toString(); // 'Symbol(123)'

// ⚠️
undefinedValue.toString(); // ❌ TypeError
nullValue.toString(); // ❌ TypeError

So the battle really comes down to toString() and String() when you want to convert a value to a string. This one does a pretty good job. Except it will throw an error for undefined and null. So definitely be mindful of this

String()

String(string); // 'hello'
String(number); // '123'
String(boolean); // 'true'
String(array); // '1,2,3'
String(object); // '[object Object]'
String(symbolValue); // 'Symbol(123)'
String(undefinedValue); // 'undefined'
String(nullValue); // 'null'

Alright, I think we found the winner 🏆

As you can see, the String() handles the null and undefined quite well. No errors are thrown - unless that’s what you want. Remember my suggestion is generally speaking. You will know your app the best, so you should pick the most suitable way for your situation.

Conclusion: String() 🏆

After showing you how all the different methods handle different type of value. Hopefully, you are aware of the differences and you will know what tool to pick up the next time you tackle your code. If you’re not sure, String() is always a good default 👍

#javascript

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Buddha Community

5 Ways to Convert a Value to String in JavaScript
Lowa Alice

Lowa Alice

1624399200

JavaScript Strings Tutorial

JavaScript Strings

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The origin of the article: https://www.youtube.com/watch?v=09BwruU4kiY&list=PLTjRvDozrdlxEIuOBZkMAK5uiqp8rHUax&index=6
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Thanks for visiting and watching! Please don’t forget to leave a like, comment and share!

#javascript #strings #javascript strings #javascript strings tutorial

Madilyn  Kihn

Madilyn Kihn

1590478483

Convert String To Array Using Javascript Split Method

The easiest approach to use javascript built-in method String.split().

#javascript #javascript string #string to array #morioh #array

Rahul Jangid

1622207074

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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Hire Dedicated JavaScript Developers -Hire JavaScript Developers

It is said that a digital resource a business has must be interactive in nature, so the website or the business app should be interactive. How do you make the app interactive? With the use of JavaScript.

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Niraj Kafle

1589255577

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.

#javascript-interview #javascript-development #javascript-fundamental #javascript #javascript-tips