JavaScript

1. Java Script Module 2. World Wide Web (WWW) 3. Web Terms 4. NEED FOR SCRIPT 5. Introduction to Internet Programming 6. CLIENT SIDE and SERVER SIDE Scripting 7. Different Scripting Languages 8. Introduction to JavaScript 9. JavaScript and Security 10. How to Enable JavaScript 11. Advantages of Java Script 12. Limitations with JavaScript 13. Difference between JavaScript and JAVA 14. Difference between JavaScript and VBScript 15. JavaScript Development Tools 16. JavaScript Programming Techniques 17. JavaScript terms 18. Starting with JavaScript Programming step by step 19. Time to start JavaScript Programming 20. JavaScript Variables 21. JavaScript RESERVED WORDS 22. JavaScript Data Type 23. NUMBER DATA TYPE 24. BOOLEAN DATA TYPE 25. STRING DATA TYPE 26. NULL DATA TYPE 27. JavaScript Undefined DATA TYPE 28. JavaScript Operators 29. JavaScript Arithmetic Operators 30. JavaScript Logical Operators 31. JavaScript Comparison Operators 32. JavaScript String Operators 33. Bit Manipulation Operators 34. JavaScript Assignment Operators 35. JavaScript Conditional Operator 36. Conversion between JavaScript Data Types 37. Alert JavaScript function 38. confirm JavaScript function 39. prompt JavaScript function 40. JavaScript Statements 41. Single line & Multi-line Comments 42. JavaScrip If Statement 43. JavaScript if..else Statements 44. JavaScript If…else..if statement. 45. JavaScript For Statement 46. JavaScript For..in Statement: 47. JavaScript While Statement 48. JavaScript do while Statement: 49. JavaScript break and continue statement 50. JavaScript switch Statement: 51. JavaScript function() 52. JavaScript function with a Return Value 53. JavaScript with Statement 54. try, catch, and throw Statements 55. JavaScript ARRAY 56. JavaScript array of different data types 57. JavaScript ARRAY and Bubble sorting Program 58. JavaScript Array Methods 59. concate() method 60. every() method 61. filter() method 62. forEach() method 63. indexOf() method 64. Join() method 65. lastIndexOf() method 66. map() method 67. reduce() method 68. reduceRight() method 69. reverse() method 70. some() method 71. toSource() method 72. toString() method 73. pop() method 74. push() method 75. shift () method 76. slice () method 77. splice () method 78. sort() method 79. unshift() method 80. EVENT handling with JavaScript 81. onblur JavaScript Event 82. onchange JavaScript Event 83. onclick JavaScript Event 84. onDblClick JavaScript Event 85. onfocus JavaScript Event 86. onkeydown JavaScript Event 87. onkeyup JavaScript Event 88. Onkeypress JavaScript Event 89. onLoad JavaScript Event 90. onMousedown JavaScript Event 91. onMouseup JavaScript Event 92. Onmouseover JavaScript Event 93. onmouseout JavaScript Event 94. onMouseMove JavaScript Event 95. onReset JavaScript Event 96. onsubmit JavaScript Event 97. onUnload JavaScript Event 98. The Screen Object 99. JavaScript Interview Part1 100. JavaScript Interview Part2 101. JavaScript Interview Part3 102. JavaScript Interview Part4 103. JavaScript Interview Part5 104. JavaScript Interview Part6 105. JavaScript Interview Part7 106. JavaScript Interview Part8 107. JavaScript Interview Part9 108. JavaScript Interview Part10
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NUMBER DATA TYPE tutorials

  • Numbers are the easiest of the data types to understand. They represent numeric values.

  • Number data type in JavaScript are floating-point numbers. But they may or may not have a fractional decimal number. If they don’t have decimal point or fractional component, they are treated as integer.

  • The simplest type of number is an integer .

  • JavaScript can handle integer values between 253 and -253.

  • It is further subdivided into 2 type i.e.

Integer

Floating Point Numbers

 

a) Integer:

  • Integers can be represented in form of decimal, hexadecimal or octal.

  • Decimal number (Base 10) – it is digit numbers from 0 to 9.

  • Hexadecimal number (Base 16) – in JavaScript it must begins with "0X" or "0x" (Zero X or Zero x). It consists of numbers from 0 to 9 representing values from 0 to 9, and letters A to F representing values as 10 to 15

  • An Octal (Base 8) – in JavaScript it must begins with "0" (Zero). It consists of only 0 to 7 numbers.

  • Both hexadecimal and octal numbers can be negative, but they cannot have a decimal portion, and they cannot be written in scientific (exponential) notation.

 

Example: JavaScript Example shows the addition of decimal, hexadecimal and octal numbers.
Output:

Decimal addition of 21+21= 42

Hexadecimal addition of 0x9 + 0x9 = 18

Octal addition of 05 + 05 = 10

 

  • From the above example, we have three variables a, b and c.the first document.write statement print the output addition of decimal number, second document.write statement print the output as addition of Hexadecimal number, and third document.write statement print the output as addition of octal number, which is shown in the output.

 

b) Floating-Point Numbers:

  • This type data is used to declare very small number, very large number or numbers with decimal point. You can also use exponent ("e" or "E") with this type of data.

  • JavaScript represents numbers using the eight byte IEEE 754 floating-point standard for numerical representation. This means you can write numbers as large as 1.79769x10308, and as small as 5x10-324.

Example:

0.0001, 1e-4, 1.0e-4 // Three equivalent floating-point numbers.

3.45e2 // A floating-point number.

 

Example: JavaScript Example shows the use of floating point numbers.
Output:

a=21.75

b=2100000

c=0.00021

 

  • From the above example, the three variables are a,b and c : which contain the floating point numbers, the document .write statement print the output as floating point numbers.

 

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