local resty_redis = require "resty.redis" local utility = require "utility" function get_redis() local redis, err = resty_redis:new() if not redis then return nil, err end local ok, err = redis:connect("127.0.0.1", 6379) if ok then return redis else return nil, err end end function close_redis(res) local redis = res[0] local data = res[1] redis:close() return data end local res, err = utility.try({ get_redis function(red) local data, err = redis:get("something") return { redis, data }, err end, close_redis }, function(err) return nil, "some error happened" end) utility.noop() -- nothing happend utility.once(function() -- only call once end)

local Array = require "utility.array" local arr = Array({}) -- {} local arr1 = Array({ 1, 2, 3 }) -- { 1, 2, 3 } local arr2 = Array.from({ 1, 2, 3 }) -- { 1, 2, 3 } arr:concat(arr1) arr:each(function(value, index, arr) end) arr:every(function(value, index, arr) end) arr:fill(1) arr:filter(function(value, index, arr) end) arr:find(function(value, index, arr) end) arr:findIndex(function(value, index, arr) end) arr:forEach(function(value, index, arr) end) arr:includes(1) arr:indexOf(1) arr:join('-') arr:lastIndexOf(1) arr:map(function(value, index, arr) end) arr:pop() arr:push(1) arr:reduce(function(result, value, index, arr) end, 0) arr:reduceRight(function(result, value, index, arr) end, 0) arr:reverse() arr:shift() arr:slice(0, 1) arr:some(function(value, index, arr) end) arr:sort(function(value1, value2) end) arr:splice(0, 1) arr:toString() arr:unshift(1) arr:diff(arr1) -- arr_only, arr1_only arr:union(arr1, arr2) -- arr U arr1 U arr2

local Function require "utility.function" local func = Function(function(arg1, arg2, arg3) print(arg1 .. " " .. arg2 .. " " .. arg3) end) -- 1 2 3 func(1, 2, 3) -- 1 2 3 func:apply({ 1, 2, 3 }) -- 1 2 4 func:bind(1, 2)(2, 3, 4) -- 1 2 2 3 4 func:call(1, 2, 3)

local Object = require "utility.array" -- { a = 2, b = 3, c = 2, d = 3 } Object.assign({ a = 1, b = 1 }, { a = 2, c = 2 }, { b = 3, d = 3 }) -- { a = 1, b = 1 } Object.pick({ a = 1, b = 1, c = 1 }, { "a", "b" }) -- { c = 1 } Object.omit({ a = 1, b = 1, c = 1 }, { "a", "b" }) -- 1 Object.get({ a = { a = 1 }, b = 1, c = 1 }, "a.a") -- or { "a", "a" } -- 0 Object.get({ a = 1, b = 1, c = 1 }, "a.a", 0) -- { a = { a = 1 } } Object.set({}, "a.a", 1) -- { a = { a = 1 } } Object.set({}, { "a", "a" }, 1) -- { "a", "b", "c" } Object.keys({ a = 1, b = 2, c = 3 }) -- { 1, 2, 3 } Object.values({ a = 1, b = 2, c = 3 }) -- { { "a", 1 }, { "b", 2 }, { "c", 3 } } Object.entries({ a = 1, b = 2, c = 3 }) local obj = { a = "a" } Object.freeze(obj) -- after this, obj is not editable obj.a = "b" -- { a = "a" } obj.b = "b" -- { a = "a" }

local String = require "utility.string" String.endsWith("test.lua", ".lua") -- true String.endsWith("test.lua", ".lu") -- false String.replace("test.lua", ".", "-") -- "test-lua" String.replace("$a-$b", { a = "aaa", b = "bbb" }) -- "aaa-bbb" String.replace("${a}-${b}", { a = "aaa", b = "bbb" }, function(k) return "${" .. k .. "}" end) -- "aaa-bbb" String.slice("test.lua", 1, 5) -- test String.split("test.lua", ".") -- { "test", "lua" } String.startsWith("test.lua", "test") -- true String.startsWith("test.lua", "est") -- false String.trim(" test.lua ") -- "test.lua" String.trimLeft(" test.lua ") -- "test.lua " String.trimRight(" test.lua ") -- " test.lua"