String methods in TypeScript

5 years ago
Afaq Arif
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In this chapter, we will discuss numbers and string methods in TypeScript with examples.

We can work with a series of characters using the string object. It covers the string earliest data type with several helper methods.

Syntax

var var_name = new String(string);

A list of the methods available in the String object along with their description is given below. Click to read all Literal Types.

S.No.	Property & Description
1.	Constructor It returns a reference to the String function that creates the object.
2.	It returns the length of the string.
3.	The prototype property allows you to add properties and methods to an object.

String Methods

A list of the methods available in the String object along with their description is given below.

S.No.	Method & Description
1.	charAt() It returns the character at the specified index.
2.	charCodeAt() It returns a number showing the Unicode value of the character at the given index.
3.	concat() It combines the text of two strings and gives a new string.
4.	indexOf() It returns the index within the calling String object of the first occurrence of the specified value, or -1 if not found.
5.	lastIndexOf() It returns the index within the calling String object of the last occurrence of the specified value, or -1 if not found.
6.	localeCompare() It returns a number showing whether a reference string comes before or after or is the same as the given string in sort order.
7.	match() It matches a regular expression against a string.
8.	replace() It finds a match between a regular expression and a string and replaces the matched substring with a new substring.
9.	search() It runs the search for a match between a regular expression and a specified string.
10.	slice() It removes a section of a string and returns a new string.
11.	split() It splits a String object into an array of strings by separating the string into substrings.
12.	substr() It returns the characters in a string beginning at the specified location through the specified number of characters.
13.	substring() It returns the characters in a string between two indexes into the string.
14.	toLocaleLowerCase() The characters within a string are changed to lower case while respecting the current locale.
15.	toLocaleUpperCase() The characters within a string are changed to an upper case while respecting the current locale.
16.	toLowerCase() It returns the calling string value changes to lower case.
17.	toString() It returns a string showing the specified object.
18.	toUpperCase() It returns the calling string value changes to uppercase.
19.	valueOf() It returns the first value of the specified object.