JavaScript Hoisting

// This is how you would expect to write the code
var x = 8; // Initialize and assign 8 to x
 
console.log('X has the value: '+ x);  // The printed text is: "X has the value: 8"
 
 
// Here y is assigned before it is declared
y = 8; // Assign 8 to y
 
console.log('Y has the value: '+ y);  // The printed text is: "Y has the value: 8"
 
var y; // Declare y

// Declare and assign the variable at the end
// Only the declaration is hoisted
console.log('Z has the value: '+ z);  // The printed text is: "Z has the value: undefined"
 
var z = 8; // Declare and assign 8 to z

// This is how you would expect to write the code
function printName(name) {
  console.log("My name is " + name);
}
 
printName("Donald");  // The printed text is: "My name is Donald"
 
 
 
// Here the function is called before it is declared
printCity("London");  // The printed text is: "My favorite city is London"
 
function printCity(name) {
  console.log("My favorite city is " + name);
}

JavaScript is one of the 3 core language technologies of the World Wide Web that all web developers must learn:

1.      HTML to define the content of web pages.

2.      CSS to specify the layout of web pages.

3.      JavaScript to program the behavior of web pages.

JavaScript is a scripting or programming language that allows you to implement complex things on web pages. Every time a web page does more than just sit there and display static information for you to look at, displaying timely content updates, interactive maps, animated 2D/3D graphics, scrolling video jukeboxes, etc. − you can bet that JavaScript is probably involved.

The benefits of using JavaScript are:

1.      You can validate user input before sending the page off to the server. This saves server traffic, which means less load on your server.

2.      Immediate feedback to the visitors − They don't have to wait for a page reload to see if they have forgotten to enter something.

3.      Increased interactivity − You can create interfaces that react when the user hovers over them with a mouse or activates them via the keyboard.

4.      Richer interfaces − You can use JavaScript to include such items as drag-and-drop components and sliders to give a Rich Interface to your site visitors.

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