Strings
JavaScript strings share many similarities with string implementations from other high-level languages. They represent text-based messages and data.
In this course, we will cover the basics. How to create new strings and perform common operations on them.
Here is an example of a string:
"Hello World"
String indexes are zero-based, meaning that starting position of the first character at 0 followed by others in incremental order.
Various methods are supported by string and return a new value. These methods are described below.
| Name | Description |
|---|---|
charAt() |
Returns character at specified index |
charCodeAt() |
Returns Unicode character at specified index |
concat() |
Returns two or more combined strings |
constructor |
Returns string's constructor function |
endsWith() |
Checks if a string ends with a specified value |
fromCharCode() |
Returns Unicode values as characters |
includes() |
Checks if a string contains with a specified value |
indexOf() |
Returns the index of its first occurance |
lastIndexOf() |
Returns the index of its last occurance |
length |
Returns the length of the string |
localeCompare() |
Compares two strings with locale |
match() |
Matches a string against a value or regular expression |
prototype |
Used to add properties and method of an object |
repeat() |
Returns new string with number of copies specified |
replace() |
Returns a string with values replaced by a regular expression or a string with a value |
search() |
Returns an index based on a string's match against a value or regular expression |
slice() |
Returns a string containing part of a string |
split() |
Splits string into array of substrings |
startsWith() |
Checks strings begining against specifed character |
substr() |
Extracts part of string, from start index |
substring() |
Extracts part of string, between two indices |
toLocalLowerCase() |
Returns string with lowercase characters using host's locale |
toLocalUpperCase() |
Returns string with uppercase characters using host's locale |
toLowerCase() |
Returns string with lowercase characters |
toString() |
Returns string or string object as string |
toUpperCase() |
Returns string with uppercase characters |
trim() |
Returns string with removed whitespaces |
trimEnd() |
Returns string with removed whitespaces from end |
trimStart() |
Returns string with removed whitespaces from start |
valueOf() |
Returns primitive value of string or string object |