String at()The at() method of strings returns the character (one UTF-16 code unit) at an index, including negative indices for getting the character relative to the end of the string. Also known as the relative indexing method.stringStringswidely2022-03-142024-09-14https://tc39.es/ecma262/multipage/text-processing.html#sec-string-objectshttps://developer.mozilla.org/docs/Web/JavaScript/Reference/Global_Objects/String/atjavascript.builtins.String.athttps://nowyoucanuse.com/features--string-at.html