[READ-ONLY] Mirror of https://github.com/thoda-dev/du-lua-cheatsheet. a simple cheatsheet for lua in Dual Universe
dual-universe
lua
Update README.md
+74
-74
+74
-74
README.md
+74
-74
README.md
···
44
44
type{} <-> type({})
45
45
```
46
46
47
-
## Tables / arrays
47
+
## constants
48
48
49
49
```lua
50
-
t = {}
51
-
t = { a = 1, b = 2 }
52
-
t.a = function() ... end
50
+
nil
51
+
false
52
+
true
53
+
```
53
54
54
-
t = { ["hello"] = 200 }
55
-
t.hello
55
+
## operators and thei metatable names
56
56
57
-
-- Remember, arrays are also tables
58
-
array = { "a", "b", "c", "d" }
59
-
system.print(array[2]) -- "b" (one-indexed)
60
-
system.print(#array) -- 4 (length)
57
+
```lua
58
+
-- Relational (binary)
59
+
-- __eq __lt __gt __le __ge
60
+
== < > <= >=
61
+
~= -- Not equal, just like !=
61
62
63
+
-- Arithmetic (binary)
64
+
-- __add __sub __muv __div __mod __pow
65
+
+ - * / % ^
62
66
63
-
-- API functions
64
-
table.foreach(t, function(row) --[[do something for one row]] end) -- Iterates over the table
65
-
table.setn(t, 10) -- Sets the length of the table
66
-
table.insert(t, 21) -- append (--> t[#t+1] = 21)
67
-
table.insert(t, 4, 99) -- insert (--> t[4] = 99)
68
-
table.getn(t) -- length (--> #t)
69
-
table.concat(t, ", ") -- join (--> "a, b, c, d")
70
-
table.sort(t) -- sort (--> { "a", "b", "c", "d" }
71
-
table.sort(t, function(a,b) return a > b end) -- sort (--> { "d", "c", "b", "a" }
72
-
table.remove(t, 4) -- remove (--> "d")
67
+
-- Arithmetic (unary)
68
+
-- __unm (unary minus)
69
+
-
70
+
71
+
-- Logic (and/or)
72
+
nil and false --> nil
73
+
false and nil --> false
74
+
0 and 20 --> 20
75
+
10 and 20 --> 20
76
+
77
+
78
+
-- Length
79
+
-- __len(array)
80
+
#array
81
+
82
+
83
+
-- Indexing
84
+
-- __index(table, key)
85
+
t[key]
86
+
t.key
87
+
88
+
-- __newindex(table, key, value)
89
+
t[key]=value
90
+
91
+
-- String concat
92
+
-- __concat(left, right)
93
+
"hello, "..name
94
+
95
+
-- Call
96
+
-- __call(func, ...)
73
97
```
74
98
75
99
## Loops
···
145
169
doAction('write', "Shirley", "Abed")
146
170
```
147
171
172
+
## Tables / arrays
173
+
174
+
```lua
175
+
t = {}
176
+
t = { a = 1, b = 2 }
177
+
t.a = function() ... end
178
+
179
+
t = { ["hello"] = 200 }
180
+
t.hello
181
+
182
+
-- Remember, arrays are also tables
183
+
array = { "a", "b", "c", "d" }
184
+
system.print(array[2]) -- "b" (one-indexed)
185
+
system.print(#array) -- 4 (length)
186
+
187
+
188
+
-- API functions
189
+
table.foreach(t, function(row) --[[do something for one row]] end) -- Iterates over the table
190
+
table.setn(t, 10) -- Sets the length of the table
191
+
table.insert(t, 21) -- append (--> t[#t+1] = 21)
192
+
table.insert(t, 4, 99) -- insert (--> t[4] = 99)
193
+
table.getn(t) -- length (--> #t)
194
+
table.concat(t, ", ") -- join (--> "a, b, c, d")
195
+
table.sort(t) -- sort (--> { "a", "b", "c", "d" }
196
+
table.sort(t, function(a,b) return a > b end) -- sort (--> { "d", "c", "b", "a" }
197
+
table.remove(t, 4) -- remove (--> "d")
198
+
```
199
+
148
200
## Lookups
149
201
150
202
```lua
···
217
269
218
270
```
219
271
220
-
## constants
221
-
222
-
```lua
223
-
nil
224
-
false
225
-
true
226
-
```
227
-
228
-
## operators and thei metatable names
229
-
230
-
```lua
231
-
-- Relational (binary)
232
-
-- __eq __lt __gt __le __ge
233
-
== < > <= >=
234
-
~= -- Not equal, just like !=
235
-
236
-
-- Arithmetic (binary)
237
-
-- __add __sub __muv __div __mod __pow
238
-
+ - * / % ^
239
-
240
-
-- Arithmetic (unary)
241
-
-- __unm (unary minus)
242
-
-
243
-
244
-
-- Logic (and/or)
245
-
nil and false --> nil
246
-
false and nil --> false
247
-
0 and 20 --> 20
248
-
10 and 20 --> 20
249
-
250
-
251
-
-- Length
252
-
-- __len(array)
253
-
#array
254
-
255
-
256
-
-- Indexing
257
-
-- __index(table, key)
258
-
t[key]
259
-
t.key
260
-
261
-
-- __newindex(table, key, value)
262
-
t[key]=value
263
-
264
-
-- String concat
265
-
-- __concat(left, right)
266
-
"hello, "..name
267
-
268
-
-- Call
269
-
-- __call(func, ...)
270
-
```
271
-
272
-
## API Global Functions
272
+
## Global Functions
273
273
274
274
```lua
275
275
assert(x) -- Throws an error if x is false
···
291
291
tonumber("8f", 16) -- 143
292
292
```
293
293
294
-
## API: Strings
294
+
## Strings
295
295
296
296
```lua
297
297
'string'..'concatenation' -- "stringconcatenation"