ES6 - ciągi
Obiekt String umożliwia pracę z serią znaków; opakowuje on typ danych typu string, w języku JavaScript, wieloma metodami pomocniczymi.
Ponieważ JavaScript automatycznie konwertuje między prymitywami łańcuchowymi a obiektami typu String, można wywołać dowolną metodę pomocniczą obiektu String na prymitywach łańcuchowych.
Użyj następującej składni, aby utworzyć obiekt String.
var val = new String(string);
Parametr string to seria znaków, które zostały poprawnie zakodowane. Strunowy.
Właściwości ciągu
Poniżej znajduje się lista właściwości obiektu String oraz jego opis.
Sr.No | Właściwość i opis |
---|---|
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. |