how to delete all elements in a Lua table?

Question

How do I delete all elements inside a Lua table? I don\'t want to do:

t = {}
table.insert(t, 1)
t = {}  -- this assigns a new pointer to t

I w

Answer 1

Table elements insert and remove performance compare

The Table size count 10000000

[1] while and rawset

while #t ~= 0 do rawset(t, #t, nil) end

spent time = 0.677220

[2] next and rawset

for k in next, t do rawset(t, k, nil) end

spent time = 0.344533

[3] ipairs and rawset

for i, v in ipairs(t) do t[i] = nil end

spent time = 0.012450

[4] for, rawset

count = #t
for i=0, count do t[i]=nil end

spent time = 0.009308

Table elemnets insert

[1] table insert function

for i=0, 10000000 do    table.insert(t, i, i) end

spent time = 1.0590489

[2] use #t

for i=0, 10000000 do    t[#t+1] = i end

spent time = 0.703731

[3] for, rawset

for i=0, 10000000 do rawset(t, i, i) end

spent time = 0.100010

result.

Fastest remove : 4

Fastest insert : 3