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Learn more about JavaScript Function

Function is a group of JavaScript statements that we declare once in our script and call over and over again.

Features of JavaScript Function

JavaScript is created by function keyword, followed by function name and followed by parentheses ().

Function names can contain only letters, digits, underscores, and dollar signs.

Parentheses contain parameter names separated by commas – (parameter1, parameter2, parameter3, ….)

Within curly brackets write code to execute function.

Declaring a Function

function name( parameter1, parameter2, parameter3, parameter4, …. ) statements return value

Example:-

function calculateResult ( maths, english, science) var totalMarks = maths + english + science; return totalMarks; alert ( “Total Marks are:” + calculateResult(70, 80, 90) );

Calling a function

After declare a function, we call a function by specifying the name of function, followed by an open parenthesis, comma-delimited parameters, and a closing parenthesis.

Example:-

alert ( “Total Marks are:” + calculateResult(70, 80, 90) );

Function Return

When JavaScript reaches a return statement, the function will stop executing. We use return statement to return a value from a function.

Syntax for the return keyword

return expression

Example-

function calculateResult ( maths, english, science) var totalMarks = maths + english + science; return totalMarks; // Now the function is defined, so it can be called

document.write( “Total Marks are:” + calculateResult(70, 80, 90) );

In above example, document..write() method call the calculateResult() function. And the calculateResult() function returns the value of the totalMarks variable, document..write() method displays totalMarks on the Web page.

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What is innerHTML in javascript?

The innerHTML is used to set or get the HTML content of an element node. In simple language by innerHTML method we can read/change the child(s)’ content of the parent(root) element.

Syntax

<!DOCTYPE html> <html> <body> <div id="example1"> Rose flower </div> <div id="example2"> </div> <script> var a = document.getElementById("example1").innerHTML; // On return, var a contains the serialized HTML code describing all of the element's descendants example1. alert("example 1 is" + a); var b = a; document.getElementById("example2").innerHTML = b; alert("example 2 is" + b); // Removes all of element's children parses the content string and assigns the resulting nodes as children of the element. </script> </body> </html>

Working example –

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Booleans in Javascript

Booleans

There are some unique comparator in javascript, which allow to compare value.

When we use comparator it will return booleans values, which either is true or false.

Sometime we require a data type, that can only have two or one value. For example as:-

True/Flase

Yes/No

On/Off

The Boolean Function

Syntax

boolean( expression )

Argument

expression expression to be evaluated, the expression can be refer numbers or node-sets as well as booleans.

Example:1 For greater than

5>2

Result: Bollean value True

Example:2 For equals

4==1

Result: Bollean value False

Example:3 For less than

6<2

Result: Bollean value False

Example:4 For not equal

8 != 2

Result: Bollean value True

Example:5 For greater or equal

8 >= -4

Result: Bollean value True

Example:6 For less or equal

5 <= 5

Result: Bollean value True

Example:-

var a = 5; var b = 2; var c; c = ( a > b ); alert(c); document.write(c);

</script>

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