What is the Lua equivalent to python's "in" statement?

Question

Does Lua have any statement equivalent to the "in" statement of python?

Example:

if "word" in variable:

Duplicate: https://stackoverflow.com/questions/656199/search-for-an-item-in-a-lua-list — susenj, Nov 03 '20 at 13:14
Does this answer your question? [Search for an item in a Lua list](https://stackoverflow.com/questions/656199/search-for-an-item-in-a-lua-list) — Jeanne Dark, Nov 03 '20 at 13:34
Python's `in` works differently for strings, lists, and dicts. Do you need code examples for all 3? — luther, Nov 03 '20 at 16:02

score 2 · Answer 1 · answered Nov 03 '20 at 16:33

Lua has no equivalent of Python's in operator, but if you know what container type you want to emulate, it's easy to write a function for it.

`str`

The true argument ensures that the substring is treated literally and not as a pattern. See string.find for details.

local function inString(s, substring)
  return s:find(substring, 1, true)
end

local function inArray(array, x)
  for _, v in ipairs(array) do
    if v == x then
      return true
    end
  end
  return false
end

local function inKeys(t, k)
  return t[k] ~= nil
end

score 1 · Answer 2 · answered Nov 03 '20 at 13:15

1

Use find

string.find('banana', 'an')

answered Nov 03 '20 at 13:15

balderman