JavaScript own objects(Web Technology)

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The document provides an overview of JavaScript, focusing on its object-oriented features and the Math object. It explains how JavaScript allows for the creation of objects that contain properties and methods, with examples of usage for mathematical operations. Additional information includes various methods available in the Math object, as well as mathematical constants that can be accessed statically.

WT ALA: JavaScript Own Objects
Dhananjaysinh Jhala,
TY CE-1,
Batch B,
170410107027

Index
 Introduction to JavaScript, objects
 JavaScript own objects
 Example

Introduction to JavaScript, objects
 JavaScript is the programming language of HTML and the Web.
 JavaScript is used to program the behavior of web pages.
 Web pages are not the only place where JavaScript is used. Many desktop and server
programs use JavaScript.
 JavaScript variables are containers for data values. But objects can contain many values.
 JavaScript objects are containers for named values called properties or methods.
 E.g. var person = {firstName:“Ian", lastName:“Somerhalder", age:41, eyeColor:"blue"};
 The name:values pairs in JavaScript objects are called properties.
 Objects can also have methods.

JavaScript's own objects
 JavaScript has its own objects. A good example of this is the Math object.
 It has several properties and methods.
 Properties such as PI are accessed as:
 Document. Write(Math.PI); {if you want to print the value of PI}
 The value PI is also known as a constant so it can’t be changed by assignment.
 There are lots of useful methods attached to the Math object too.
 They are accessed in a similar way:
 myValue = Math.round(10.2);
 These have brackets to contain values which are passed to the method.

Math.round()
<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Math.round()</h2>
<p>Math.round(x) returns the value of x rounded to its nearest integer:</p>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHTML = Math.round(4.4);
</script>
</body>
</html>

Math.pow(x,y)
Math.pow(x,y) returns the value of x to the power y.

<!DOCTYPE html>
<html>
<body>
<h2>JavaScript Math.pow()</h2>
<p>Math.pow(x,y) returns the value of x to
the power of y:</p>
<p id="demo"></p>
<script>
document.getElementById("demo").innerHT
ML = Math.pow(2,8);
</script>
</body>
</html>

Other methods of Math object
 Math.sqrt(x) returns the square root of x.
 Math.abs(x) returns the absolute (positive) value of x.
 Math.ceil(x) returns the value of x rounded up to its nearest integer.
 Math.floor(x) returns the value of x rounded down to its nearest integer.
 Math.sin(x) returns the sine (a value between -1 and 1) of the angle x.
 Sly we have Math.cos(x)
 Math.min() and Math.max() can be used to find the lowest or highest value in a list of
arguments.
 Math.random() returns a random number between 0 (inclusive), and 1 (exclusive).

Math constants
 JavaScript provides 8 mathematical constants that can be accessed with the Math
object.

 Unlike other global objects, the Math object has no constructor. Methods and properties are static.
 We also have other methods iike acos, asin, tan, atan, exp…

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JavaScript own objects(Web Technology)

1. WT ALA: JavaScript Own Objects Dhananjaysinh Jhala, TY CE-1, Batch B, 170410107027

2. Index  Introduction to JavaScript, objects  JavaScript own objects  Example

3. Introduction to JavaScript, objects  JavaScript is the programming language of HTML and the Web.  JavaScript is used to program the behavior of web pages.  Web pages are not the only place where JavaScript is used. Many desktop and server programs use JavaScript.  JavaScript variables are containers for data values. But objects can contain many values.  JavaScript objects are containers for named values called properties or methods.  E.g. var person = {firstName:“Ian", lastName:“Somerhalder", age:41, eyeColor:"blue"};  The name:values pairs in JavaScript objects are called properties.  Objects can also have methods.

4. JavaScript's own objects  JavaScript has its own objects. A good example of this is the Math object.  It has several properties and methods.  Properties such as PI are accessed as:  Document. Write(Math.PI); {if you want to print the value of PI}  The value PI is also known as a constant so it can’t be changed by assignment.  There are lots of useful methods attached to the Math object too.  They are accessed in a similar way:  myValue = Math.round(10.2);  These have brackets to contain values which are passed to the method.

5. Math.round() <!DOCTYPE html> <html> <body> <h2>JavaScript Math.round()</h2> <p>Math.round(x) returns the value of x rounded to its nearest integer:</p> <p id="demo"></p> <script> document.getElementById("demo").innerHTML = Math.round(4.4); </script> </body> </html>

7. Math.pow(x,y) Math.pow(x,y) returns the value of x to the power y.

8. <!DOCTYPE html> <html> <body> <h2>JavaScript Math.pow()</h2> <p>Math.pow(x,y) returns the value of x to the power of y:</p> <p id="demo"></p> <script> document.getElementById("demo").innerHT ML = Math.pow(2,8); </script> </body> </html>

10. Other methods of Math object  Math.sqrt(x) returns the square root of x.  Math.abs(x) returns the absolute (positive) value of x.  Math.ceil(x) returns the value of x rounded up to its nearest integer.  Math.floor(x) returns the value of x rounded down to its nearest integer.  Math.sin(x) returns the sine (a value between -1 and 1) of the angle x.  Sly we have Math.cos(x)  Math.min() and Math.max() can be used to find the lowest or highest value in a list of arguments.  Math.random() returns a random number between 0 (inclusive), and 1 (exclusive).

11. Math constants  JavaScript provides 8 mathematical constants that can be accessed with the Math object.

12.  Unlike other global objects, the Math object has no constructor. Methods and properties are static.  We also have other methods iike acos, asin, tan, atan, exp…

JavaScript own objects(Web Technology)

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