In the world of programming, working with numbers is a very common task. In Javascript, one of the most popular programming languages, there are number numeric variables, which are used to store numerical values. In this article, we will explore what they are and how to use number variables in Javascript.
What is a Number?
In Javascript, a Number is a data type used to represent numerical values. These values can be integers or numbers with decimals. Numbers in Javascript are objects that have associated properties and methods.
To create a number variable in Javascript, you simply assign it a numeric value. For example:
var age = 25; var price = 9.99;
In the example above, we have created two number variables: "age" which has an integer value of 25, and "price" which has a decimal value of 9.99.
Operations with Number variables
Once we have our number variables, we can perform various operations with them. We can add, subtract, multiply and divide numbers using arithmetic operators. Let's look at some examples:
var num1 = 10; var num2 = 5; var sum = num1 + num2; // sum = 15 var subtraction = num1 - num2; // subtraction = 5 var multiplication = num1 * num2; // multiplication = 50 var division = num1 / num2; // division = 2
In addition to basic arithmetic operations, we can also use increment and decrement operators:
var num = 10; num++; // increment by 1: num = 11 num--; // decrement by 1: num = 10
Another very common operation is to compare numbers. We can use comparison operators like "<", ">", "<=", ">=", "==" and "!=" to evaluate if one number is greater than, less than or equal to another:
var num1 = 5; var num2 = 10; var major = num1 < num2; // major = true var minor = num1 > num2; // less = false var equals = num1 == num2; // equals = false
Properties and methods of Number variables
In addition to the basic operations, number variables also have properties and methods that we can use. Some useful properties include:
- MAX_VALUE: The MAX_VALUE property returns the largest number possible in Javascript.
- MIN_VALUE: The MIN_VALUE property returns the smallest number possible in Javascript.
- NaN: The NaN (Not-a-Number) property represents a value that is not a number.
- POSITIVE_INFINITY: The POSITIVE_INFINITY property represents positive infinity.
- NEGATIVE_INFINITY: The NEGATIVE_INFINITY property represents negative infinity.
Additionally, number variables have methods like:
- toFixed: The toFixed() method rounds a number to a specified number of decimal places and returns a text string.
- toPrecision: The toPrecision() method rounds a number to the specified number of digits and returns a text string.
- toString: The toString() method converts a number to a text string.
Conclusion
In Javascript, number variables are essential for working with numeric values. We have explored what Numbers are, how to create number variables, perform arithmetic operations, and use associated properties and methods. I hope this article has been helpful in your learning Javascript.
If you want to continue learning about programming and marketing, feel free to visit my blog at nelkodev.com. You can also contact me here or check my briefcase.
Frequently asked questions
1. What are number variables in Javascript?
The number variables in Javascript are used to store numerical values. They can be integers or numbers with decimals.
2. What is the difference between an integer and a decimal number?
An integer is a number without decimals, while a decimal number has a fraction part.
3. What are some operations that can be performed with number variables in Javascript?
Some common operations include adding, subtracting, multiplying, and dividing numbers, as well as comparing numbers and using increment and decrement operators.
4. What properties and methods do number variables have in Javascript?
The number variables have properties such as MAX_VALUE, MIN_VALUE, NaN, POSITIVE_INFINITY, and NEGATIVE_INFINITY, as well as methods such as toFixed(), toPrecision(), and toString().
English 
Spanish