TypeScript Number

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TypeScript is a superset of JavaScript that provides optional static typing, making it easier to write complex code. One of the basic data types that TypeScript provides is the number data type. In this lesson, we will go over what TypeScript numbers are, how they work, and how to use them with code examples.

What is a Number in TypeScript?

In TypeScript, a number is a data type that represents a numeric value. Numbers can be used to store and manipulate numeric data in your code.

You can declare a number variable using the following syntax:

let count: number = 10;

In this example, we create a variable called count of type number and set its initial value to 10.

How to Use a Number in TypeScript

Once you have defined a number variable, you can use it in your code like this:

let count: number = 10;
console.log(count);

In this example, we declare a variable called count and set its initial value to 10. We then use the console.log() function to print the value of count to the console.

You can perform arithmetic operations on numbers using the standard mathematical operators:

let x: number = 5;
let y: number = 10;
let sum: number = x + y;
let difference: number = x - y;
let product: number = x * y;
let quotient: number = x / y;
console.log(sum, difference, product, quotient);

In this example, we declare two number variables called x and y. We then perform arithmetic operations on these two numbers and store the results in variables called sum, difference, product, and quotient. We use the console.log() function to print the values of these variables to the console.

You can also use the isNaN() function to check if a value is a valid number:

let x: number = NaN;
console.log(isNaN(x)); // true

In this example, we declare a number variable called x and set its value to NaN (which stands for “Not a Number”). We then use the isNaN() function to check if x is a valid number. Since x is NaN, the isNaN() function returns true.

Conclusion

In conclusion, numbers are a fundamental feature of TypeScript that are used to store and manipulate numeric data in your code. With numbers, you can perform arithmetic operations and check for valid numeric values. Numbers make your code more powerful and versatile.