Fundamentals of JavaScript
Explore the fundamentals of JavaScript focusing on data types, variable declaration and initialization, user input handling, and essential operators. Understand how different data types affect operations and how to manipulate input values properly to write effective JavaScript code.
Types of data in programming
Several forms of data may be used in programming. Here’s an example:
let persons = 1;
let greet = "Hello!";
In the example above:
- The variable,
persons, stores a number. - The variable,
greet, stores a string.
Variable declaration
In JavaScript, we use let to declare a variable. Here’s an example:
let persons; // declaring a variable
Here, the variable persons is declared, but its value is undefined.
Note: It is a good practice to initialize every variable.
Variable initialization
Assigning ...