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.