-
Notifications
You must be signed in to change notification settings - Fork 726
/
kotlin
191 lines (166 loc) · 4.5 KB
/
kotlin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
/**
* Nested
/**
* Comments
*/
*/
/**
* This is a straightforward implementation of The Game of Life
* See http://en.wikipedia.org/wiki/Conway's_Game_of_Life
*/
package life
/*
* A field where cells live. Effectively immutable
*/
class Field(
val width: Int,
val height: Int,
// This function tells the constructor which cells are alive
// if init(i, j) is true, the cell (i, j) is alive
init: (Int, Int) -> Boolean
) {
private val live: Array<Array<Boolean>> = Array(height) { i -> Array(width) { j -> init(i, j) } }
private fun liveCount(i: Int, j: Int)
= if (i in 0..height - 1 &&
j in 0..width - 1 &&
live[i][j]) 1 else 0
// How many neighbors of (i, j) are alive?
fun liveNeighbors(i: Int, j: Int) =
liveCount(i - 1, j - 1) +
liveCount(i - 1, j) +
liveCount(i - 1, j + 1) +
liveCount(i, j - 1) +
liveCount(i, j + 1) +
liveCount(i + 1, j - 1) +
liveCount(i + 1, j) +
liveCount(i + 1, j + 1)
// You can say field[i, j], and this function gets called
operator fun get(i: Int, j: Int) = live[i][j]
}
/**
* This function takes the present state of the field
* and returns a new field representing the next moment of time
*/
fun next(field: Field): Field {
return Field(field.width, field.height) { i, j ->
val n = field.liveNeighbors(i, j)
if (field[i, j])
// (i, j) is alive
n in 2..3 // It remains alive iff it has 2 or 3 neighbors
else
// (i, j) is dead
n == 3 // A new cell is born if there are 3 neighbors alive
}
}
`maven-publish-plugin`
/** A few colony examples here */
fun main(args: Array<String>) {
// Simplistic demo
runGameOfLife("***", 3)
// "Star burst"
runGameOfLife("""
_______
___*___
__***__
___*___
_______
""", 10)
// Stable colony
runGameOfLife("""
_____
__*__
_*_*_
__*__
_____
""", 3)
// Stable from the step 2
runGameOfLife("""
__**__
__**__
__**__
""", 3)
// Oscillating colony
runGameOfLife("""
__**____
__**____
____**__
____**__
""", 6)
// A fancier oscillating colony
runGameOfLife("""
-------------------
-------***---***---
-------------------
-----*----*-*----*-
-----*----*-*----*-
-----*----*-*----*-
-------***---***---
-------------------
-------***---***---
-----*----*-*----*-
-----*----*-*----*-
-----*----*-*----*-
-------------------
-------***---***---
-------------------
""", 10)
}
data class Point(x: Float, y: Float)
class ExampleChild(x: Int): Parent(x) {
fun something(): Thing<MyType> {
val thisThing = OtherThing(x)
return Thing<MyType>()
}
}
// UTILITIES
fun runGameOfLife(fieldText: String, steps: Int) {
var field = makeField(fieldText)
for (step in 1..steps) {
println("Step: $step")
for (i in 0..field.height - 1) {
for (j in 0..field.width - 1) {
print(if (field[i, j]) "*" else " ")
}
println("")
}
field = next(field)
}
}
fun makeField(s: String): Field {
val lines = s.replace(" ", "").split('\n').filter({ it.isNotEmpty() })
val longestLine = lines.toList().maxBy { it.length } ?: ""
return Field(longestLine.length, lines.size) { i, j -> lines[i][j] == '*' }
}
fun `backtickedFunction`() {
return
}
fun <T, V> genericFunction() {
return
}
fun String.extensionFunction() {
return
}
fun `String`.`backTickedExtensionFunction`() {
return
}
fun <T, V : Comparable> String.genericExtensionFunction() {
return
}
inline fun <reified T> membersOf() = T::class.members
public interface List<out E> : Collection<E> {}
public interface Comparable<in T> {}
@Deprecated("This is an annotation")
fun anAnnotatedFunction() = {
}
val (a, b) = pair
loop@ for (i in 1..100) {
for (j in 1..100) {
if (...) break@loop
}
}
val ints = listOf(1, 4_20, 100L, 123_345_678U)
val bins = listOf(0b1, 0B0, 0b10_10_01, 0b10U, 0b10uL)
val hexes = listOf(0xFF, 0Xa, 0x10L, 0X0UL)
val exponents = listOf(1e10, -1E10F, 1.5e10, 1e-10)
val doublesAndFloats = listOf(3.14, .99, 22f, 1_000.000_1, 19.95F)
// comment at EOF (#797)