Editing Impact of string conversion on a string This edit will create a new revision. Your details (optional) Name Email (won’t be displayed; might be used for Gravatar) URL Test case details Title * Published (uncheck if you want to fiddle around before making the page public) Description (in case you feel further explanation is needed)(Markdown syntax is allowed) In this test case, I check whether which way of converting any input to a string for type safety reason has the least impact on the performance in case a string is passed as argument. Are you a spammer? (just answer the question) Preparation code Preparation code HTML (this will be inserted in the <body> of a valid HTML5 document in standards mode) (useful when testing DOM operations or including libraries) Include JavaScript libraries as follows: <script src="//cdn.ext/library.js"></script> Define setup for all tests (variables, functions, arrays or other objects that will be used in the tests) (runs before each clocked test loop, outside of the timed code region) (e.g. define local test variables, reset global variables, clear canvas, etc.) (see FAQ) window.a = function a(s) { return String(s).length; } window.b = function b(s) { return (""+s).length; } window.c = function c(s) { if(typeof(s)=="string") { return s.length; } else { return (""+s).length; } } window.d = function a(s) { return String(s).length; } window.e = function b(s) { return (""+s).length; } window.f = function c(s) { return (typeof(s)=="string")?s.length:(""+s).length; } Define teardown for all tests (runs after each clocked test loop, outside of the timed code region) (see FAQ) Code snippets to compare Test 1 Title Async (check if this is an asynchronous test) Code window.tmp = a("Abc")==3 Test 2 Title Async (check if this is an asynchronous test) Code window.tmp = b("Abc")==3 Test 3 Title Async (check if this is an asynchronous test) Code window.tmp = c("Abc")==3 Test 4 Title Async (check if this is an asynchronous test) Code window.tmp = d("Abc")==3 Test 5 Title Async (check if this is an asynchronous test) Code window.tmp = e("Abc")==3 Test 6 Title Async (check if this is an asynchronous test) Code window.tmp = f("Abc")==3