Contents

local opening_bracket = {
  ['('] = true,
  ['['] = true,
  ['{'] = true
}

local closing_bracket = {
  [')'] = '(',
  [']'] = '[',
  ['}'] = '{'
}

return {
  valid = function(s)
    local history = {}

    for c in s:gmatch('.') do
      if opening_bracket[c] then
        table.insert(history, c)
      elseif closing_bracket[c] then
        if history[#history] ~= closing_bracket[c] then return false end
        table.remove(history, #history)
      end
    end

    return #history == 0
  end
}

Version data entries

396 entries across 396 versions & 1 rubygems

Version	Path
trackler-2.2.1.180	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.179	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.178	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.177	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.176	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.175	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.174	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.173	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.172	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.171	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.170	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.169	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.167	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.166	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.165	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.164	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.163	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.162	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.161	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.160	tracks/lua/exercises/bracket-push/example.lua