# Module: `nupp.data.utf8` UTF-8 codepoint operations over strings and byte views. ## Functions ### `decodeAt` _function_ ```nupp local decodeAt: function(value: string | nupp.io.ByteView, byteOffset: integer): (integer?, integer) ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `value` | `string | nupp.io.ByteView` | | | `byteOffset` | `integer` | | #### Returns | Type | Description | | --- | --- | | `integer?` | | | `integer` | | ### `decodeBefore` _function_ ```nupp local decodeBefore: function(value: string | nupp.io.ByteView, byteOffset: integer): (integer?, integer) ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `value` | `string | nupp.io.ByteView` | | | `byteOffset` | `integer` | | #### Returns | Type | Description | | --- | --- | | `integer?` | | | `integer` | | ### `encode` _function_ ```nupp local encode: function(codepoint: integer): string ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `codepoint` | `integer` | | #### Returns | Type | Description | | --- | --- | | `string` | | ### `isValid` _function_ ```nupp local isValid: function(value: string | nupp.io.ByteView): boolean ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `value` | `string | nupp.io.ByteView` | | #### Returns | Type | Description | | --- | --- | | `boolean` | | ### `length` _function_ ```nupp local length: function(value: string | nupp.io.ByteView): integer ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `value` | `string | nupp.io.ByteView` | | #### Returns | Type | Description | | --- | --- | | `integer` | | ### `truncate` _function_ ```nupp local truncate: function(text: string, maxBytes: integer): string ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `text` | `string` | | | `maxBytes` | `integer` | | #### Returns | Type | Description | | --- | --- | | `string` | | ### `validPrefixLength` _function_ ```nupp local validPrefixLength: function(value: string | nupp.io.ByteView, maxBytes: integer): integer ``` #### Arguments | Name | Type | Description | | --- | --- | --- | | `value` | `string | nupp.io.ByteView` | | | `maxBytes` | `integer` | | #### Returns | Type | Description | | --- | --- | | `integer` | |