Learn about the JavaScript String Methods & How to Use Them

String.prototype.endsWith() Determines whether a string ends with the characters of the string searchString. String.prototype.concat() Combines the text of two strings and returns a new string. The trimEnd() method works like trim(), but removes whitespace only from the end of a string. If you want to replace all matches, use a regular expression with the /g flag set. Slice() extracts a part of a string and returns the extracted part in a new string. This list is by no means exhaustive, there are many more methods, and some are much less known than others.

For example, the toUpperCase() method returns the string converted to uppercase. In JavaScript, strings are used to represent and work with a sequence of characters. A string can represent an object as well as the primitive data type. Because JavaScript treats strings as an object when methods or properties get executed on them, they still have that functionality. This ability is due to the String object in the JavaScript library, though it’s not intended for creating string objects. Creating string objects results in slower processing and potentially errant results, so use them cautiously.

substring(from, )

Java stage gives the String class to create and control strings. This JavaScript String Functions will list out some of the most commonly used string functions. Strings also have methods for doing search/replace with regular expressions. But that’s big topic, so it’s explained in a separate tutorial section Regular expressions. ToUpperCase– return a string with all characters converted to uppercase.

So, the test if ( ~str.indexOf(“…”) ) is truthy only if the result of indexOf is not -1. One of the old tricks used here is the bitwise NOT ~ operator. It converts the number to a 32-bit integer and then reverses all bits in its binary representation.

JavaScript Objects

For instance, if we have S followed by the special “dot above” character (code \u0307), it is shown as Ṡ. You will find more ways to deal with surrogate pairs later in the chapter Iterables. There are probably special libraries for that too, but nothing famous enough to suggest here. Note that pieces of the surrogate pair have no meaning without each other. So the alerts in the example above actually display garbage. Capital characters go first, then a few special ones, then lowercase characters, and Ö near the end of the output.

Split Splits a String into an array of strings by separating the string into substrings based on specified separator. Substr Returns the characters in a string from specified starting position through the specified number of characters . Substring Returns the characters in a string between start and end indexes. ToLocaleLowerCase() Converts a string to lower case according to current locale.

What are the top 20 Javascript String Functions and how to use them?

Examples might be simplified to improve reading and basic understanding. While using this site, you agree to have read and accepted our terms of use and privacy policy.

• String.fromCharCode() Returns a string created by using the specified sequence of Unicode values.
• The “right” algorithm to do string comparisons is more complex than it may seem, because alphabets are different for different languages.
• Because JavaScript treats strings as an object when methods or properties get executed on them, they still have that functionality.
• You can clearly see that in alert from the examples above.
• In many languages, there are symbols that are composed of the base character with a mark above/under it.
• String literals and strings returned from String calls in a non-constructor context are primitive strings.

Initially, JavaScript language was created for the browser only. But now, the language is used in many other environments also.

Extracting String Parts

The optional “limit” is an integer that lets you specify the maximum number of elements to return. Function will return a string created by using specified sequence of unicode values.

Moving on with this article on Javascript String functions, let’s understand replace function. This function combines one or more strings into existing one. Javascript is a high-level programming language which is having curly bracket syntax, dynamic typing & prototype based on object-orientation.

It performs type conversion when called as a function, rather than as a constructor, which is usually more useful. The String object is used to represent and manipulate a sequence of characters. If the separator is omitted, the returned array will contain the whole string in index . If you omit the second parameter, substr() will slice out the rest of the string. Learn more about the differences between and uses of these popular programming languages. It is used to return the primitive value of a String object.

It is used to check whether a string contains the specified string or characters. Backticks allow a string to span multiple lines and embed expressions $. It provides a special method to compare strings in different languages, following their rules. In JavaScript, the textual data is stored as strings. ToLowerCase – return a string with all characters converted to lowercase.

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All lowercase letters go after uppercase letters because their codes are greater. Str.substr(start )Returns the part of the string from start, with the given length. Please note that str.length is a numeric property, not a function. People with a background in some other languages sometimes mistype by calling str.length() instead of just str.length.

• LocaleCompare Compares two strings in the current locale.
• We can’t “replace” the first character, because strings in JavaScript are immutable.
• Of the other two variants, slice is a little bit more flexible, it allows negative arguments and shorter to write.
• Sometimes, your code will include strings which are very long.
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It is a scripting language used to create and control dynamic website content. It means the webpage can move, refresh, or change on the user’s screen without manually reloading a web page. If str is empty, then str is undefined, and as undefined doesn’t have the toUpperCase() method, we’ll get an error.