JavaScript String Reference
JavaScript Strings
A JavaScript string stores a series of characters like "John Doe".
A string can be any text inside double or single quotes:
String indexes are zero-based:
The first character is in position 0, the second in 1, and so on.
String Properties and Methods
Normally, strings like "John Doe", cannot have methods or properties because they are not objects.
But with JavaScript, methods and properties are also available to strings, because JavaScript treats strings as objects when executing methods and properties.
Note;
All string methods return a new value.
They do not change the original variable.
| Method | Description |
|---|---|
| charAt() | Returns the character at a specified index (position) |
| charCodeAt() | Returns the Unicode of the character at a specified index |
| concat() | Returns two or more joined strings |
| endsWith() | Returns if a string ends with a specified value |
| fromCharCode() | Returns Unicode values as characters |
| includes() | Returns if a string contains a specified value |
| indexOf() | Returns the index (position) of the first occurrence of a value in a string |
| lastIndexOf() | Returns the index (position) of the last occurrence of a value in a string |
| localeCompare() | Compares two strings in the current locale |
| match() | Searches a string for a value, or a regular expression, and returns the matches |
| repeat() | Returns a new string with a number of copies of a string |
| replace() | Searches a string for a value, or a regular expression, and returns a string where the values are replaced |
| search() | Searches a string for a value, or regular expression, and returns the index (position) of the match |
| slice() | Extracts a part of a string and returns a new string |
| split() | Splits a string into an array of substrings |
| startsWith() | Checks whether a string begins with specified characters |
| substr() | Extracts a number of characters from a string, from a start index (position) |
| substring() | Extracts characters from a string, between two specified indices (positions) |
| toLocaleLowerCase() | Returns a string converted to lowercase letters, using the host's locale |
| toLocaleUpperCase() | Returns a string converted to uppercase letters, using the host's locale |
| toLowerCase() | Returns a string converted to lowercase letters |
| toString() | Returns a string or a string object as a string |
| toUpperCase() | Returns a string converted to uppercase letters |
| trim() | Returns a string with removed whitespaces |
| valueOf() | Returns the primitive value of a string or a string object |
JavaScript String Properties
| Property | Description |
|---|---|
| constructor | Returns the string's constructor function |
| length | Returns the length of a string |
| prototype | Allows you to add properties and methods to an object |
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