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{{Stub/Player}} == LUA Code Snippets == === Passing Tables === ==== LUA code ==== <nowiki> globaldb = {} for i=1,10000 do globaldb[i] = "Foo" end do local scopedb = {} for i=1,10000 do scopedb[i] = "Foo" end function dostuff(DB) for i=1,1000,1 do DB[i] = "foo" end end function testpassing() local starttime,endtime,localpass,scopepass,globalpass local localdb = {} for i=1,10000,1 do localdb[i] = "Foo" end starttime = os.clock() for i=1,10000,1 do dostuff(localdb) end endtime = os.clock() localpass = endtime - starttime starttime = os.clock() for i=1,10000,1 do dostuff(scopedb) end endtime = os.clock() scopepass = endtime - starttime starttime = os.clock() for i=1,10000,1 do dostuff(globaldb) end endtime = os.clock() globalpass = endtime - starttime print("Local: " .. localpass) print("Scope: " .. scopepass) print("Global: " .. globalpass) end end globalref = {} for i=1,1000 do globalref[i] = "Foo" end do local scopedb = {} for i=1,1000 do scopedb[i] = "Foo" end function dostuffglobal() for i=1,1000,1 do globalref[i] = "Foo" end end function dostuffscope() for i=1,1000,1 do scopedb[i] = "Foo" end end function testref() local starttime,endtime,scopepass,globalpass starttime = os.clock() for i=1,10000,1 do dostuffscope() end endtime = os.clock() scopepass = endtime - starttime starttime = os.clock() for i=1,10000,1 do dostuffglobal() end endtime = os.clock() globalpass = endtime - starttime print("Scope: " .. scopepass) print("Global: " .. globalpass) end end print("Testing by passing arguments.") testpassing() print("Testing by reference.") testref() </nowiki> ==== Results ==== Testing by passing arguments. Local: 0.453 Scope: 0.469 Global: 0.438 Testing by reference. Scope: 0.594 Global: 0.718 Testing by passing arguments. Local: 0.438 Scope: 0.453 Global: 0.453 Testing by reference. Scope: 0.563 Global: 0.734 Testing by passing arguments. Local: 0.453 Scope: 0.453 Global: 0.453 Testing by reference. Scope: 0.563 Global: 0.734 Testing by passing arguments. Local: 0.453 Scope: 0.453 Global: 0.453 Testing by reference. Scope: 0.563 Global: 0.734 Testing by passing arguments. Local: 0.453 Scope: 0.453 Global: 0.469 Testing by reference. Scope: 0.562 Global: 0.735 Testing by passing arguments. Local: 0.453 Scope: 0.453 Global: 0.469 Testing by reference. Scope: 0.562 Global: 0.735 ==== Summary ==== Passing via argument doesn't lead any performance benefit and is faster than passing via scope or global === Nested If Statements === ==== LUA code ==== <nowiki> function testifs(a,b,c,d) local starttime,endtime,nested,notnested local dumpvar starttime = os.clock() for i=1,1000000,1 do if (a) then if (b) then if (c) then if (d) then dumpvar = i end end end end end endtime = os.clock() nested = endtime - starttime starttime = os.clock() for i=1,1000000,1 do if (a and b and c and d) then dumpvar = i end end endtime = os.clock() notnested = endtime - starttime print("Nested if: " .. nested) print("Non-nested if: " .. notnested) print("Difference: " .. (nested - notnested)) end </nowiki> ==== LUA Code List ==== <nowiki> function testifs(a,b,c,d) (62 instructions, 248 bytes at 00191630, 4 params, 13 slots, 0 upvalues, 17 locals, 8 constants, 0 functions) 2 [1] SETGLOBAL 0 -1 ; testifs local starttime,endtime,nested,notnested local dumpvar starttime = os.clock() 1 [5] GETGLOBAL 9 -1 ; os 2 [5] GETTABLE 9 9 -2 ; "clock" 3 [5] CALL 9 1 2 4 [5] MOVE 4 9 for i=1,1000000,1 do 5 [6] LOADK 9 -3 ; 1 6 [6] LOADK 10 -4 ; 1000000 7 [6] LOADK 11 -3 ; 1 8 [6] FORPREP 9 9 ; to 18 18 [6] FORLOOP 9 -10 ; to 9 if (a) then 9 [7] TEST 0 0 0 10 [7] JMP 7 ; to 18 if (b) then 11 [8] TEST 1 0 0 12 [8] JMP 5 ; to 18 if (c) then 13 [9] TEST 2 0 0 14 [9] JMP 3 ; to 18 if (d) then 15 [10] TEST 3 0 0 16 [10] JMP 1 ; to 18 dumpvar = i 17 [11] MOVE 8 12 end end end end end endtime = os.clock() 19 [18] GETGLOBAL 9 -1 ; os 20 [18] GETTABLE 9 9 -2 ; "clock" 21 [18] CALL 9 1 2 22 [18] MOVE 5 9 nested = endtime - starttime 23 [19] SUB 6 5 4 starttime = os.clock() 24 [21] GETGLOBAL 9 -1 ; os 25 [21] GETTABLE 9 9 -2 ; "clock" 26 [21] CALL 9 1 2 27 [21] MOVE 4 9 for i=1,1000000,1 do 28 [22] LOADK 9 -3 ; 1 29 [22] LOADK 10 -4 ; 1000000 30 [22] LOADK 11 -3 ; 1 31 [22] FORPREP 9 9 ; to 41 41 [22] FORLOOP 9 -10 ; to 32 if (a and b and c and d) then 32 [23] TEST 0 0 0 33 [23] JMP 7 ; to 41 34 [23] TEST 1 0 0 35 [23] JMP 5 ; to 41 36 [23] TEST 2 0 0 37 [23] JMP 3 ; to 41 38 [23] TEST 3 0 0 39 [23] JMP 1 ; to 41 dumpvar = i 40 [24] MOVE 8 12 end end endtime = os.clock() 42 [28] GETGLOBAL 9 -1 ; os 43 [28] GETTABLE 9 9 -2 ; "clock" 44 [28] CALL 9 1 2 45 [28] MOVE 5 9 notnested = endtime - starttime 46 [29] SUB 7 5 4 print("Nested if: " .. nested) 47 [30] GETGLOBAL 9 -5 ; print 48 [30] LOADK 10 -6 ; "Nested if: " 49 [30] MOVE 11 6 50 [30] CONCAT 10 10 11 51 [30] CALL 9 2 1 print("Non-nested if: " .. notnested) 52 [31] GETGLOBAL 9 -5 ; print 53 [31] LOADK 10 -7 ; "Non-nested if: " 54 [31] MOVE 11 7 55 [31] CONCAT 10 10 11 56 [31] CALL 9 2 1 print("Difference: " .. (nested - notnested)) 57 [32] GETGLOBAL 9 -5 ; print 58 [32] LOADK 10 -8 ; "Difference: " 59 [32] SUB 11 6 7 60 [32] CONCAT 10 10 11 61 [32] CALL 9 2 1 </nowiki> ==== Summary ==== LUA is smart enough to code both nested if's and multiple boolean parameters the same. Code whichever is better for readability.

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