[javascript] 14. 문자열(Strings) - 자바스크립트 강좌 JS / CSE

JavaScript Strings

 자바스크립트 문자열은 문자열을 저장하거나 변경하는데 사용합니다.

1. JavaScript Strings

 문자열은 어떤 문자든 따옴표안에 넣을 수 있습니다.

 

 
var answer = "It's alright";
var answer = "He is called 'Johnny'";
var answer = 'He is called "Johnny"';

 

2. String Length

 문자열의 길이는 속성 length로 알 수 있습니다.

 

var txt = "ABCDEFGHIJKLMNOPQRSTUVWXYZ";
var sln = txt.length;

 

3. Special Characters

 문자열은 따옴표 안에 있어야 하므로, 자바스크립트는 아래와 같은 문자열을 잘못 인식 할 수 있습니다.

 

 

var y = "We are the so-called "Vikings" from the north."

 위 문자열은 원하는 문자열을 출력하지 못합니다.

 해결책은 Escape Character(\)를 사용하는 것 입니다.

 

var x = 'It\'s alright';
var y = "We are the so-called \"Vikings\" from the north."

 

Code	Outputs
\'	single quote
\"	double quote
\\	backslash
\n	new line
\r	carriage return
\t	tab
\b	backspace
\f	form feed

[ 출처: W3Schools ]

4. String Properties

 

Property	Description
constructor	Returns the function that created the String object's prototype
length	Returns the length of a string
prototype	Allows you to add properties and methods to an object

[ 출처: W3Schools ]

5. String Methods

Method	Description
charAt()	Returns the character at the specified index (position)
charCodeAt()	Returns the Unicode of the character at the specified index
concat()	Joins two or more strings, and returns a copy of the joined strings
fromCharCode()	Converts Unicode values to characters
indexOf()	Returns the position of the first found occurrence of a specified value in a string
lastIndexOf()	Returns the position of the last found occurrence of a specified value in a string
localeCompare()	Compares two strings in the current locale
match()	Searches a string for a match against a regular expression, and returns the matches
replace()	Searches a string for a value and returns a new string with the value replaced
search()	Searches a string for a value and returns the position of the match
slice()	Extracts a part of a string and returns a new string
split()	Splits a string into an array of substrings
substr()	Extracts a part of a string from a start position through a number of characters
substring()	Extracts a part of a string between two specified positions
toLocaleLowerCase()	Converts a string to lowercase letters, according to the host's locale
toLocaleUpperCase()	Converts a string to uppercase letters, according to the host's locale
toLowerCase()	Converts a string to lowercase letters
toString()	Returns the value of a String object
toUpperCase()	Converts a string to uppercase letters
trim()	Removes whitespace from both ends of a string
valueOf()	Returns the primitive value of a String object

[ 출처: W3Schools ]