JavaScript Statements

Statements and declarations

To run a application on a computer the computer program is following instructions. These instructions are executede by the computer.

Most programming languages will call these instructions statements

All JavaScript applications consist of statements and one single statement may span multiple lines. 

Statements and declarations - Some simple example

JS JavaScript - Statements and declarations - Some simple example

var a, b, c;   // Then statement nr. 1
a = 7;         // Then statement nr. 2
b = 12;       // Then statement nr. 3
c = a * b;    // Then statement nr. 4
alert("The expected value of c: " + c); // Expected value = 84

Learn more about JavaScript Variables

Categories - Declarations

var  Declares a variable. This can optionally be initialized to a value

let  Declares a block scope local variable.

const  Declares a read-only named constant.

Learn more about JavaScript Var Learn more about JavaScript Let Learn more about JavaScript Const

Categories - Control Flow

Block When grouping zero or more statements the block statement is used. The block is delimited by a pair of curly brackets.

break Terminates the current loop, switch, or label statement and transfers program control to the statement following the terminated statement.

continue The continue statement terminates the execution of the current iteration in a loop. the execution of the loop continues with the next iteration.

Empty An empty statement is used to provide no statement, although the JavaScript syntax would expect one.

if..else If specified condition is true the if statement executes. If the condition is false, another statement can be executed.

switch The switch statement will evaluate an expression and try to match the expressions value in a case clause, and executes statements related to that case.

throw Will throw a user-defined exception.

try...catch Is for marking a block of statements to try. It will also specify a response, should an exception be thrown.

Categories - Function and classes

function This is used to declare a function and specify related parameters.

function* Generator Functions will simplify the way we write a iterator.

async function This is used to declare a async function and specify related parameters.

return The value that is returned by a function is spesified here.

class When declaring an ordinary class.

Learn more about JavaScript Functions

Categories - Iterations

do...while This loop will execute a defined statement until the test condition evaluates to false. The statement will always execute at least once.

for The for loop consists of three optional expressions, embedded in parentheses. Each expression is separated by semicolons, followed by a statement that is executed in the loop. Will iterate over the enumerable properties of an object. The statements can be executed for each distinct property.

for...of Is iterationg over iterable objects (such as arrays, array-like objects, iterators and generators).

while This loop will execute a defined statement as long as the test condition is equal to true. 

Learn more about JavaScript Loop For Learn more about JavaScript Loop While

For is deprecated but will likely still work.

For is iterating a specified variable over all values of object's properties and for each property a statement will be executed.


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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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