JS String Object
String object
String objects are used to work with text (strings).
String object creation method: new String() .
Grammar
var txt = new String("string");
Or a simpler way:
var txt = "string";
For the String object tutorial, check out JavaScript String Object Tutorial .
String object properties
| Property | Description |
|---|---|
| constructor | Reference to the function that created the object |
| length | The length of the string |
| prototype | Allows you to add properties and methods to objects |
String object methods
| Method | Description |
|---|---|
| charAt() | Returns the characters in the specified position. |
| charCodeAt() | Returns the Unicode encoding of the characters in the specified position. |
| concat() | Concats two or more strings and returns a new string. |
| endsWith() | Determines whether the current string ends with the specified substring (case sensitive). |
| fromCharCode() | Converts Unicode encoding to characters. |
| indexOf() | Returns the position where a specified string value first appeared in the string. |
| includes() | Looks for whether the specified substring is included in the string. |
| lastIndexOf() | Searches for strings from back to front and calculates the position where the string last appears starting from the start position (0). |
| match() | Finds a match for one or more regular expressions. |
| repeat() | Copies the string a specified number of times and returns them concatenated together. |
| replace() | Finds the matching substring in the string and replaces the substring that matches the regular expression. |
| replaceAll() | Finds matching substrings in the string and replaces all substrings that match the regular expression. |
| search() | Looks for a value that matches a regular expression. |
| slice() | Extracts a fragment of a string and returns the extracted part in a new string. |
| split() | Splits a string into an array of strings. |
| startsWith() | Checks whether the string begins with the specified substring. |
| substr() | Extracts the specified number of characters from the string from the starting index number. |
| substring() | Extracts the characters between two specified index numbers in a string. |
| toLowerCase() | Converts a string to lowercase. |
| toUpperCase() | Converts a string to uppercase. |
| trim() | Strips away white space on either side of the string. |
| toLocaleLowerCase() | Converts strings to lowercase based on the localhost's locale |
| toLocaleUpperCase() | Converts strings to uppercase based on the localhost's locale. |
| valueOf() | Returns the original value of a string object. |
| toString() | Returns a string. |
String HTML wrapper method
HTML returns the content contained in the corresponding HTML tag.
The following methods are not standard methods, so may not be supported in some browsers.
| Method | Description |
|---|---|
| anchor() | Create HTML anchors. |
| big() | Display strings in large font. |
| blink() | A flashing string is displayed. |
| bold() | Strings are displayed in bold. |
| fixed() | Display the string in typewriter text. |
| fontcolor() | Displays the string using the specified color. |
| fontsize() | Displays the string using the specified dimensions. |
| italics() | Display strings in italics. |
| link() | Display strings as links. |
| small() | Use small font size to display strings. |
| strike() | String to display strikethrough. |
| sub() | Display strings as subscripts. |
| sup() | Display strings as superscripts. |