ES6-文字列

Stringオブジェクトを使用すると、一連の文字を操作できます。JavaScriptの文字列プリミティブデータ型をいくつかのヘルパーメソッドでラップします。

JavaScriptは文字列プリミティブとStringオブジェクトの間で自動的に変換するため、文字列プリミティブでStringオブジェクトの任意のヘルパーメソッドを呼び出すことができます。

次の構文を使用して、Stringオブジェクトを作成します。

var val = new String(string);

文字列パラメータは、適切にエンコードされた一連の文字です。ストリング。

文字列のプロパティ

以下は、Stringオブジェクトのプロパティとその説明のリストです。

シニア番号 プロパティと説明
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.