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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 .
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| 2 | length
Returns the length of the string.
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| 3 | Prototype
The prototype property allows you to add properties and methods to an object .
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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.
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| 2 | charCodeAt()
Returns a number indicating the Unicode value of the character at the given index.
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| 3 | concat()
Combines the text of two strings and returns a new string.
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| 4 | indexOf()
Returns the index within the calling String object of the first occurrence of the specified value, or -1 if not found.
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| 5 | lastIndexOf()
Returns the index within the calling String object of the last occurrence of the specified value, or -1 if not found.
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| 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.
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| 7 | match()
Used to match a regular expression against a string.
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| 8 | replace()
Used to find a match between a regular expression and a string, and to replace the matched substring with a new substring.
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| 9 | search()
Executes the search for a match between a regular expression and a specified string.
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| 10 | slice()
Extracts a section of a string and returns a new string.
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| 11 | split()
Splits a String object into an array of strings by separating the string into substrings.
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| 12 | substr()
Returns the characters in a string beginning at the specified location through the specified number of characters.
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| 13 | substring()
Returns the characters in a string between two indexes into the string.
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| 14 | toLocaleLowerCase()
The characters within a string are converted to lower case while respecting the current locale.
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| 15 | toLocaleupperCase()
The characters within a string are converted to uppercase while respecting the current locale.
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| 16 | toLowerCase()
Returns the calling string value converted to lowercase.
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| 17 | toString()
Returns a string representing the specified object.
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| 18 | toUpperCase()
Returns the calling string value converted to uppercase.
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| 19 | valueOf()
Returns the primitive value of the specified object.
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