ES6 - Strings


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The String object lets you work with a series of characters; it wraps JavaScript’s string primitive data type with a number of helper methods.

As JavaScript automatically converts between string primitives and String objects, you can call any of the helper methods of the String object on a string primitive.

Use the following syntax to create a String object.

var val = new String(string);

The string parameter is a series of characters that has been properly encoded. String.

String Properties

Following is a list of the properties of String object and its description.

Sr.No Property & Description
1 constructor

Returns a reference to the String function that created the object .

2 length

Returns the length of the string.

3 Prototype

The prototype property allows you to add properties and methods to an object .

String Methods

Here is a list of the methods available in String object along with their description.

Sr.No Method & Description
1 charAt()

Returns the character at the specified index.

2 charCodeAt()

Returns a number indicating the Unicode value of the character at the given index.

3 concat()

Combines the text of two strings and returns a new string.

4 indexOf()

Returns the index within the calling String object of the first occurrence of the specified value, or -1 if not found.

5 lastIndexOf()

Returns the index within the calling String object of the last occurrence of the specified value, or -1 if not found.

6 localeCompare()

Returns a number indicating whether a reference string comes before or after or is the same as the given string in a sorted order.

7 match()

Used to match a regular expression against a string.

8 replace()

Used to find a match between a regular expression and a string, and to replace the matched substring with a new substring.

9 search()

Executes the search for a match between a regular expression and a specified string.

10 slice()

Extracts a section of a string and returns a new string.

11 split()

Splits a String object into an array of strings by separating the string into substrings.

12 substr()

Returns the characters in a string beginning at the specified location through the specified number of characters.

13 substring()

Returns the characters in a string between two indexes into the string.

14 toLocaleLowerCase()

The characters within a string are converted to lower case while respecting the current locale.

15 toLocaleupperCase()

The characters within a string are converted to uppercase while respecting the current locale.

16 toLowerCase()

Returns the calling string value converted to lowercase.

17 toString()

Returns a string representing the specified object.

18 toUpperCase()

Returns the calling string value converted to uppercase.

19 valueOf()

Returns the primitive value of the specified object.



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