Data Types

Data Types

Data types define what information is stored

The most used of them are:

Type	Description	Example
numeric	Whole number or floating point number.	let num1 = 5; let num2 = 2.45;
string	Sequence of characters (text).	let text = 'JS is awesome!';
boolean	Can have only 2 values - true or false.	let isAwesome = true;

Printing Data

It's done using console.log.

console.log('Message to print.');

Variables

The variables are used to store data of certain type.

Their value can be changed any time.

Example of variables definitions:

// Declaring variable with value: let num1 = 5; // Declaring variable and setting value later: let num2; num2 = -3; let num3 = 2.5; // String values are set in single or double quotes. let name1 = 'Alex'; let name2 = "Smith"; // Char values are set in single or double quotes. let letter = 'c'; let boolVariable1 = true; let boolVariable2 = false;

Basic program example:

Write a program in which variables are defined and printed.

Solution:

let device = 'PC'; let number = 5; console.log(number + ' ' + device);

Output:

5 PC