I was reading a post yesterday about function overloading in javascript, and the suggested solution had quite a performance overhead when used with multiple signatures.
\nIn addition, it only used the number of arguments, and not their types and order to distinguish between the signatures.<\/p>\n
For some reason I woke up early this morning with a solution to this.
\nThe following code will do all of the above and has the same overhead for all number of signatures.<\/p>\n
\r\n\/\/returns an overloadable method\r\nFunction.CreateOverloaded = function(){\r\n var overloads = [];\r\n \/\/creates the overloaded method\r\n var func = function(){\r\n var sign = [];\r\n for (var i=0;i < arguments.length; i++) {\r\n sign.push(typeof arguments[i]);\r\n }\r\n sign = sign.join();\r\n var func = overloads["(" + sign + ")"];\r\n if (!func) {throw "No matching signature";}\r\n return func.apply(this, arguments);\r\n };\r\n\r\n \/\/method for adding a function with a spesific signature\r\n func.AddSignature = function(func, sign){\r\n if (overloads["(" + sign + ")"]){throw "Duplicate signature"};\r\n overloads["(" + sign + ")"] = func;\r\n };\r\n return func;\r\n}\r\n<\/pre>\nTo test it you can use the following code<\/p>\n
\r\nvar myFunc = Function.CreateOverloaded();\r\nmyFunc.AddSignature(function(){\r\n alert("test1");\r\n}, "");\r\nmyFunc.AddSignature(function(var){\r\n alert(var);\r\n}, "string");\r\nmyFunc.AddSignature(function(integer){\r\n alert(integer + "x 5 = " + (integer * 5));\r\n}, "number");\r\nmyFunc.AddSignature(function(int1, int2){\r\n alert(int1 * int2);\r\n}, "number,number");\r\nmyFunc.AddSignature(function(string, int){\r\n alert(string + " equals " + int);\r\n}, "string,number");\r\n\r\nmyFunct();\r\nmyFunc("test2")\r\nmyFunc(3);\r\nmyFunc(3, 5);\r\nmyFunc("five", 5);\r\n<\/pre>\n","protected":false},"excerpt":{"rendered":"I was reading a post yesterday about function overloading in javascript, and the suggested solution had quite a performance overhead when used with multiple signatures. In addition, it only used the number of arguments, and not their types and order to distinguish between the signatures. For some reason I woke up early this morning with […]<\/p>\n","protected":false},"author":3,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[34,1],"tags":[21,8],"_links":{"self":[{"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/posts\/11"}],"collection":[{"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/users\/3"}],"replies":[{"embeddable":true,"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/comments?post=11"}],"version-history":[{"count":10,"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/posts\/11\/revisions"}],"predecessor-version":[{"id":14,"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/posts\/11\/revisions\/14"}],"wp:attachment":[{"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/media?parent=11"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/categories?post=11"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/kinsey.no\/blog\/index.php\/wp-json\/wp\/v2\/tags?post=11"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}