Friday, February 17, 2017

ES6 - Strings

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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