This document provides an overview of JavaScript/ECMAScript basics including syntax, variables, data types, operators, and statements. It covers key concepts such as case sensitivity, variable declaration and naming conventions, primitive and reference values, the typeof operator, conversions between data types, built-in objects like String and Number, and unary, arithmetic, comparison, logical, and assignment operators. The document is intended as an introduction to fundamental JavaScript concepts.

1. By: Satyen Pandya 1 JavaScript – ECMAScript Basics satu21@gmail.com

3. Primitive and Reference Values

4. Primitive Types

5. Conversions

6. Reference Types

7. Operators

8. Statements

9. Functionssatu21@gmail.com

11. Everything is case-sensitive

12. Variables are loosely typed

13. End-of-line semicolons are optional

14. Comments are the same as in Java, C, Perl

15. Braces indicate code blockssatu21@gmail.com

17. Variables do not require initialization like JAVA

20. Camel Notation (e.g. myTest, myVar)

21. Pascal Notation (e.g. MyTest, MyVar)

22. Hungarian Type Notation (e.g. sMyTest, bMyVar)satu21@gmail.com

25. Can not use as variable or function name

26. Few Reserved words :satu21@gmail.com

29. typeof returns one of below value :

30. “undefined”, “boolean”, “number”, “string”, “object”satu21@gmail.com

32. Converting to a string : var.toString()

37. constructor

38. Prototype

39. Methods :

40. hasOwnProperty(property)

41. isPrototypeof(object)

42. propertyIsEnumerable(property)

43. toString()

44. valueOf()satu21@gmail.com

46. pass only Boolean value

47. toString() – returns true or false

48. valueOf() – returns true or false

49. The Number class : reference type for Number type

50. pass only Boolean value

51. toString() – returns number primitive value

52. valueOf() – returns number primitive value

53. toFixed() – returns string representation of number

54. toExponential – returns e-notation string

55. toPrecision – returns fixed or e-notation of numbersatu21@gmail.com

57. pass only Boolean value

58. toString() – returns string primitive value

59. valueOf() – returns string primitive value

60. length – gives number of characters

61. charAt() – returns string containing character in position

62. charCodeAt() – returns character code

63. concat() – concate two or more strings

64. indexOf() – returns position of given substring

65. lastindexOf() – returns last position of given substring

66. The instanceof operator : identifies the type of objectsatu21@gmail.com

68. delete – erases reference to an object property or method

69. void – returns undefined for any value

70. prefix increment/decrement (e.g. ++a, --a)

71. postfix increment/decrement (e.g. a++, a--)

75. works directly on the binary form of numbers

76. Bitwise OR – pipe(|)

77. works directly on the binary form of numbers

78. Bitwise XOR – caret(^)

79. works directly on the binary form of numberssatu21@gmail.com

82. Logical NOT – exclamation(!), always return Boolean

83. Logical AND – double ampersand(&&)

84. Logical OR – double pipe(||)satu21@gmail.com

86. Divide : represented by slash(/)

88. Subtract : represented by minus(-)

89. Modulus : represented by percent sign(%)satu21@gmail.com

91. greater-than : represented by >

92. less-than-or-equal : represented by <=

94. Not Equal : represented by exclamation with equal sign (!=)

95. Identically equal : three equal sign (===)

96. Not identically equal : exclamation and two equal (!==)satu21@gmail.com

98. Thank you… By: Satyen Pandya 21 satu21@gmail.com