Reference FQL API reference String insert() string.insert() Insert a substring into a String at a specified index. Signature insert(index: Number, other: String) => String Description Inserts a substring into the calling String at a provided zero-based offset index position. Returns a new String. The calling String isn’t changed. Parameters Parameter Type Required Description index Number true Zero-based index position to insert the substring at. insert String true Substring to insert. Return value Type Description String String with the inserted substring. Examples fqlCopied! 'foo'.insert(0, 'bar') "barfoo" indexOfRegex() lastIndexOf()