What is a Loosely Typed Language?

Every Programming language can be classified into Strongly and Loosely/Weakly typed. This type defines the strictness of the programming language, and each of these types has its own advantages and disadvantages in the programming world.

A Loosely typed programming language is defined as a language where defining a variable's data type is not required. Variables having different data types are easily created in this language as compared to Strongly typed languages.

A data type basically signifies to the compiler what type of value this particular variable can store and what kind of operations it can perform.

Examples – string, integer, double, float, char, etc.

A Loosely typed language offers no such strong boundations on the variable data type. When a compilation takes place in this type of language, the compiler neglects minor errors based on data types and performs whatever operation is defined on it no matter what data type it holds.

To be more clear, let's say you define a variable in a Loosely type language, and during its declaration, you initialize it with a number and say later you want to store a string in this variable. Loosely typed language gives you the flexibility to interchange the value and does not throw any error during its compilation.

JavaScript Code

/* A variable named example is declared and initialized it with a number*/
var example = 23;
console.log(example);
/*Here, the data type of the variable named example is changed*/
example ="Value changed";
console.log(example);

Output

What are the characteristics of Loosely typed language?

a) These languages offer less strict typing rules compared to strongly typed languages.

b) Different data types are converted implicitly during the run time of a program.

c) Variables get converted easily into another data type regardless of their current data type.

d) During the declaration of a variable, it does not require to specify its data type.

e) For data type constraint violations, these languages do not contain any run time or compile checks.

What are the advantages of Loosely typed language?

There are various advantages of Loosely typed language; some are as follows:

Provides flexibility

These languages are much more flexible as compared to Strongly typed languages. Due to their flexible nature, these languages are preferred over Strongly typed languages to develop dynamic applications. Developers often have a tough time working on dynamic applications as these applications deal with actions to be taken from unknown data. Loosely typed languages make it quite hassle-free to deal with this as it does not strictly assign a variable to a particular data type.

Freedom of Programming

Loosely typed languages such as PHP offer liberty to developers to create their own programming rules and perform operations on them. Whereas in the other hand, Strongly typed languages have predefined rules, and developers need to stick completely to this in order to run a program successfully.

Code Reusability

In this language, a variable, once declared, can be reused again later whenever needed to do so. Developers can use a particular variable a multiple number of times to store up different data types. This is quite helpful in making the code look sorted and less lengthy during complex programs.

Faster and Less Memory Consumption

These languages are straightforward and run faster compared to Strongly typed language. Complex applications using these languages are rendered at a much faster rate. These languages also occupy less memory space by allowing developers to reuse variables. Complex applications are rendered and

Simple and Cost effective

These languages are simple and compatible to run on any system. Its simplicity attracts developers to it. Being simple, these languages, such as PHP, are free to use, which makes them cost-effective as well.

What are the disadvantages of Loosely typed language?

There are various disadvantages of Loosely typed language; some are as follows:

Produce Unexpected Results

Often, these languages outcome unexpected results. For instance, an operation was meant to be performed for an integer data type, but if a string gets passed, it will generate a random and unpredictable result. Therefore, while working with these types of language, developers need to be extra careful.

Tough to debug code

Compared to Strongly typed language, it becomes quite frustrating to debug code in a Loosely typed language. Variables get assigned multiple times in the same program, making it very hard to find which value is stored in the variable-generated unexpected outcome. On the other hand, Strongly typed languages have predefined rules and provide a lot of strictness which makes it a little easy to minimize the errors.

What are the examples of Loosely typed language?

• Perl
• PHP
• JavaScript
• VB

Difference between Strongly typed language and a Loosely typed language?

Strongly typed language	Loosely typed language
Defining a variable’s data type is mandatory.	Defining a variable’s data type is not mandatory.
This does not allow easy conversion of data types.	This allows easy conversion of data types.
Occupies more memory	Occupies Less memory
It is not flexible.	It is flexible.
It does not allow freedom of programming.	It allows freedom of programming.
Examples – Java, Scala, C#, etc.	Examples – PHP, JavaScript, VB, etc.