Kotlin: 100 Simple Codes
beginner-friendly collection of easy-to-understand Kotlin examples.
Each code snippet is designed to help you learn programming concepts step by step, from basic syntax to simple projects. Perfect for students, self-learners, and anyone who wants to practice Kotlin in a fun and practical way.
Codes:
1. Hello World
2. Variables and Constants
3. If-Else Statement
4. When Statement (Switch)
5. For Loop
6. While Loop
7. Functions
8. Return Value from Function
9. Array Example
10. List Example
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11. Mutable List
12. Map Example
13. Mutable Map
14. Class Example
15. Constructor with Default Value
16. Nullable Variable
17. Safe Call Operator
18. Elvis Operator
19. Data Class
20. Loop with Index
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21. Lambda Function
22. Higher-Order Function
23. Filter a List
24. Map a List
25. String Interpolation
26. String Templates with Expressions
27. Read-Only vs Mutable List
28. Check Element in List
29. Exception Handling
30. Null Check with let
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31. For Loop with Step
32. For Loop in Reverse
33. Break in Loop
34. Continue in Loop
35. Check String Empty or Not
36. Compare Two Numbers
37. Array Access by Index
38. Loop Through Map
39. Default Parameters in Function
40. Named Arguments
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41. Range Check
42. Function Returning Unit
43. Multiple Return Statements
44. Chained Method Calls
45. Function Inside Function
46. Function Expression Syntax
47. Array Size
48. String to Int Conversion
49. Safe String to Int Conversion
50. Repeat Block
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51. Sealed Class
52. Object Expression (Anonymous Object)
53. Singleton using Object Keyword
54. Extension Function
55. Enum Class
56. Use Enum in When Statement
57. Type Alias
58. Destructuring Declarations
59. Companion Object
60. Simple Interface Implementation
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61. Abstract Class
62. Lateinit Variable
63. Initialization Block
64. Secondary Constructor
65. Nested Class
66. Inner Class
67. Generic Function
68. Generic Class
69. Custom Getter
70. Custom Setter
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71. String Equality
72. Loop with Range Until
73. Using Pair
74. Triple Example
75. Check Type with is
76. Smart Cast
77. Type Casting with as
78. Safe Casting with as?
79. Loop Through Characters of String
80. Sum of List
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81. Min and Max of List
82. Sort List
83. Reverse List
84. Count Items in List
85. All / Any Conditions
86. Check if List is Empty
87. Join List to String
88. Take and Drop
89. Zipping Lists
90. Unzipping Pairs
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91. Chunked List
92. Windowed List
93. Flatten List
94. FlatMap
95. Remove Duplicates
96. Group By
97. Associate By
98. Measure Execution Time
99. Repeat with Index
100. Create Range and Convert to List
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