# How Do You Convert Data Type?

//

Angela Bailey

Converting data types is a common task in programming that allows us to modify the way data is stored and used. It enables us to change the format of our data, making it compatible with different operations or requirements. In this tutorial, we will explore different methods to convert data types in various programming languages.

## 1. Converting String to Integer

Converting a string to an integer is a fundamental operation in many programming languages. It allows us to perform mathematical operations or comparisons with numeric values that are initially stored as strings.

To convert a string to an integer, we can use the built-in parseInt() function in JavaScript:

``````
let str = "42";
let num = parseInt(str);
``````

In Python, we can use the int() function:

``````
str = "42"
num = int(str)
``````

## 2. Converting Integer to String

Sometimes, we may need to convert an integer to a string for various reasons. This conversion allows us to concatenate the integer with other strings or display it as part of a text output.

In JavaScript, we can achieve this by using the toString() method:

``````
let num = 42;
let str = num.toString();
``````

In Python, we can convert an integer to a string using the str() function:

``````
num = 42
str = str(num)
``````

## 3. Converting Floating-Point Numbers

To convert floating-point numbers (decimal numbers) from one type to another, similar approaches can be used.

In JavaScript, we can use parseFloat() to convert a string to a floating-point number:

``````
let str = "3.14";
let num = parseFloat(str);
``````

In Python, we can use the float() function:

``````
str = "3.14"
num = float(str)
``````

## 4. Converting Boolean Values

To convert boolean values (true/false) to other data types, we can utilize the language-specific conversion functions or methods.

In JavaScript, we can convert a boolean value to a string using the toString() method:

``````
let bool = true;
let str = bool.toString();
``````

In Python, we can achieve this by using the str() function:

``````
bool = True
str = str(bool)
``````

## 5. Converting Between Data Types in Lists

In some cases, we may need to convert data types within a list or an array. This is often required when performing calculations or manipulations on list elements.

In JavaScript, one approach is to use the map() method along with the desired conversion function:

``````
let numbers = ["1", "2", "3"];
let convertedNumbers = numbers.map(parseInt);
``````

In Python, we can utilize list comprehensions and conversion functions to achieve similar results:

``````
numbers = ["1", "2", "3"]
convertedNumbers = [int(num) for num in numbers]
``````

### In conclusion,

Converting data types is an essential skill in programming that allows us to manipulate and work with data in various ways. Whether it’s converting strings to integers, integers to strings, or even converting between different data types within a list, understanding the available conversion methods in your chosen programming language is crucial.

By utilizing functions like parseInt(), toString(), int(), and float(), you can confidently convert data types and modify your data to suit your specific needs. Remember to always consider the requirements of your program and choose the appropriate conversion method accordingly.

References:
– JavaScript parseInt() function: https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/parseInt
– Python int() function: https://docs.python.org/3/library/functions.html#int
– JavaScript toString() method: https://developer.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/toString
– Python str() function: https://docs.org/3/library/stdtypes.html#str