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Loose Typing and Type Coercion in JavaScript - Habilelabs

Let’s have a look in details about loose typing and type coercion in JavaScript. In front-end development, especially when it comes to JavaScript there are many strategies, many patterns and many methods to make a well working program or an app that can execute on a browser smoothly.

Developers adopt several methodologies to create their code and many of them do so in the languages such as Java, C, C++, C# which are evergreen with their features. Although JavaScript plays an important part there as well, these languages are strongly typed.

Now when a developer works on JavaScript only, then he or she finds that many things are relatively different as compared to strongly typed languages.

Now when we talk of loosely or strongly typed languages, then what they actually mean by that? Let us explore some of the key features and points considering loosely and strongly typed languages.

Let’s have a detailed look at loose typing and type coercion with examples:

Let’s have detailed info on loose typing first.

Loose typing:

Loose typing is nothing but the variables which have no types or in other words, if we say, then the variables declared without the type is known as loosely typed. JavaScript is one such language which supports loose typing.

Let us look over some examples to clarify more about the concept.

In the example above, we see that JavaScript has allowed declaring the variables someText and someNumber with the type as var. There is no information regarding their datatypes. This is because JavaScript is smart enough to identify the type of the variables internally.

The variable someText is considered as String and variable someNumber is taken as a number.

JavaScript is capable to identify some other data types including Boolean, Array, Object, Function, RegExp, Null and Unidentified as well, in which it has categorized them as primitive, objects and special cases.

Now let us know one more feature of JavaScript which is Type Coercion. Type Coercion is simply the process to convert a value from one type to another.

Type Coercion in detail:

type coercion in javascript

Type Coercion is the simple feature to convert the types from one to another. This feature allows reading the expressions from left to right. When the String is identified in between then all the next consecutive values after this point are taken as String.

So, all that values that occurred earlier than the first String are evaluated as per the operations applied to them and next to the String value, all others are concatenated as a single unit of String.

This will become much clearer using this example below:

CASE 1: Consider all numbers –

This will give the output as 50 which is a number. The operation performed here is of adding all of them.

CASE 2: Consider all numbers but last one as a string

This will result in as 1535 because the last value is a string. Although it is the first string encountered when proceeding from left to right and does not have any other value after it so the result will be 1535.

CASE 3: Consider all numbers but last one as a string in between

This will result as 59135. Kindly note the difference here. The result is 59135 which you will note that, after 5, the first string was spotted and hence after this point, every other value has been converted to a string and all are clubbed together as a single unit.

NOTE: The above example and text is the simple explanation to understand the type coercion. Type coercion’s usage is much broader in itself.

Type coercion can also be used on Boolean expressions, Objects, and Arrays, while comparisons and certain other operations.
Some Examples:

One more thing to note here is that conversions can be done on three types only i.e. String, Number, and Boolean. Logics to convert the primitives and the objects are somewhat different but they follow the same rule of converting them to these three types of conversions only.

Some Conversion rules to check:

STRINGS:

Values can be converted to String explicitly or implicitly. Explicit conversion takes place by using String() method. Examples:

Implicit conversion is done by using binary operator +. Examples:

BOOLEANS:

Values can be converted to Boolean implicitly and explicitly. Explicit conversion can take place by using Boolean() function. Example :

Implicit conversion happens by utilizing logical operators. Example:

Rest, I leave up to you to experiment with all the Boolean expressions.

NUMERIC:

Explicit numeric conversion occurs by using Number() function. Example:

NOTE:

1. When a value is converted from String to Number, then the browser engine first trims the first and last whitespaces associated with the string. Now after this, if the value is not found to be a number, then it simply returns NaN. If the String is empty then, it returns 0.
2. null, when evaluated as Number(null), then it returns 0 and if same is done with undefined such as Number(undefined) then it returns NaN.
3. Numeric conversion does not happen when we try to compare null or undefined with any value. They are comparable to themselves only. Example:

4. NaN is something, that is not comparable to any other values. This applies to itself as well.
Example:

Conclusion:

These two are the cool features of JavaScript that can be used carefully. Type Coercion and Loose typing allow JavaScript to be much more popular among the developers’ community all around the world.

I have tried to describe loose typing and type coercion in javascript with examples in the simplest way and I hope it is very clear to you. If you have any doubt or queries ask me in the comment section.

Habilelabs is the industry expert in javascript and providing high-quality web development and mobile development services from a long time. Contact us to discuss your project.

 

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iSEEit has been closely working with Habilelabs team ever since our company needed to step up development efforts. Being a rapidly evolving software company, we have come across a multitude of challenges over time but Habilelabs has proactively solved issues impacting the business and handled the continuous releases of the applications without downtime. We are very satisfied and happy to have found Habilelabs as our offshore development partner as they have developed a good understanding of our own vision and work flows.

We really appreciate their flexibility, agility and eagerness to learn as they grow, and we would undoubtedly recommend their services to anyone.

iSEEit

Rizan Flenner

Amazing and skilled team we been learning from each other for quite some time, and still working together.
Always available and ready to make great results, or to improve unexpected problems.

Siquo

Daniel White

https://www.siquo.com/

I am very pleased with the work Habilelabs provides. Every time we have worked, projects were delivered on time. They provide great support and I would totally recommend Habilelabs to anyone that wants to get a project done on time and professionally.

Tableluv

Xenophon Kanarios

http://tableluv.gr/

Habilelabs is an excellent and affordable programming team that delivers fast results.

Paiusa

Stephen Blaney

http://www.paiusa.com/

Good mindset, good technical competence and skills, always fix problems when needed.

Denthub

Arash Fard-Rahmani

We have been extremely satisfied with the project that has been delivered by Habilelabs. They are very professional with great commitments. Quality of communication and problem solving skills were perfect.

Safak Korkut

Very much satisfied the work. Team quickly understood the requirements and completed work on time. Would definitely recommend him. We will like to hire them again

Stanislav M.

Habilelabs is the definition of professional and friendly. They knew exactly what they are doing and never shy to share their knowledge. We will definitely consider hiring them for future projects! Great Work!

Eben B.

Great work, will hire team Habilelabs again. I appreciate the extra effort. Excellent work as always.

Saasmath

Very fast and professional Team. They knows exactly what needs to be developed to achieve the project goal. We will hire them again

Mediaroot

Very good work, Little expencive for us but prefere to work with them because I'm sure the work will be done 100%

ProwebMedia

Team habilelabs is a pleasure to work with and we will work with them again. They are professional, easy to communicate with, and completes tasks on time and on budget.

KCRW

Really impressed with the high quality work and professionalism!

Vaibhav Samadhiya

We worked Habilelabs team and they are very professional, motivated and experienced developer. I would love to work with them in the future again!

Mahdishahadat

We had a great collaboration with Habilelabs. They are very communicative, extremely competent and responsive. We are looking forward to continuing our collaboration with Habilelabs. I recommend them with full confidence.

Safkutkorfak

I'm very impressed with work quality. Habilelabs shows outstanding performance and knowledge in area needed for our project. I'm fully satisfied with Habilelabs's service. Will look for more opportunities to work with them

AdramMedia

Team habilelabs are truly great developers to work with, and ensure that the work is completed to the highest of standards. Real pleasure to work with would highly recommend for Node.js / React.js work.

Liamsm

Habilelabs is a fabulous company. Excellent in quality and always available for communication. We hired Habilelabs team for doing the frontend of my application and they gave me some good tips about backend APIs as well, which tells a lot about their overall expertise. Really appreciate their sincerity, timely delivery and professionalism. Will definitely hire them again in future.

Atul Shrivastava

very good very profasional, They did good job on time +++

Moshe Levy

Love the Company Habilelabs . Knew thier stuff and really came through for me.

Zehash

5 stars work, very good communication, timely delivery.

Anthony Hu