Editing Hashing strings 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) Looking for the fastest hash function to get a unique id of a string. 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) function bitwise(str){ var hash = 0; if (str.length == 0) return hash; for (i = 0; i < str.length; i++) { char = str.charCodeAt(i); hash = ((hash<<5)-hash)+char; } return hash; } function numbers(str) { var res = 0, len = str.length; for (var i = 0; i < len; i++) { res = res * 31 + str.charCodeAt(i); } return res; } function bitwiseconv(str){ var hash = 0; if (str.length == 0) return hash; for (i = 0; i < str.length; i++) { char = str.charCodeAt(i); hash = ((hash<<5)-hash)+char; hash = hash & hash; // Convert to 32bit integer } return hash; } function numbersconv(str) { var res = 0, len = str.length; for (var i = 0; i < len; i++) { res = res * 31 + str.charCodeAt(i); res = res & res; } return res; } 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 bitwise('[LOG] This is a a not-too-long log message, once that will commonly pop up in my application'); Test 2 Title Async (check if this is an asynchronous test) Code numbers('[LOG] This is a a not-too-long log message, once that will commonly pop up in my application'); Test 3 Title Async (check if this is an asynchronous test) Code bitwiseconv('[LOG] This is a a not-too-long log message, once that will commonly pop up in my application'); Test 4 Title Async (check if this is an asynchronous test) Code numbersconv('[LOG] This is a a not-too-long log message, once that will commonly pop up in my application');