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-2.2.1.139	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.138	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.137	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.136	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.135	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.134	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.133	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.132	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.131	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.130	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.129	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.128	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.127	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.126	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.125	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.124	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.123	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.122	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.121	tracks/lua/exercises/bracket-push/example.lua
trackler-2.2.1.120	tracks/lua/exercises/bracket-push/example.lua