JS: String | JavaScript | Tutorials by PiTribe

JavaScript String

var s = "this is string may contain any character within quotes";

String is a primitive data type in JavaScript, containg a stream of characters. The string characters may be given within double-quote " or double single-quote ', there is not difference in effect.


var x = "string within double-quotes";
var y = 'string within single-quotes';

JavaScript String Unicode

JavaScript String accepts Unicode in four-digit Hexadecimal format follwed by \u

var uc = "\u2718" ✘

Single or double Quotes in string

A string value may also require single or double quotes with string. This can be achieved with escapsequence '\''.


var str = 'This is my friend\'s home';

"This is my friend's home"

Similarly, double quotes may also be added to the string:


var str = "Martin Luther King Jr. said, \"Injustice anywhere is threat to justice everywhere\"";

'Martin Luther King Jr. said, "Injustice anywhere is threat to justice everywhere"'

anything just after \ within a string is called escape sequence e.g. '\\' for backslash and '\t' for Tab.

string length

length property returns the number of characters


var str = 'PiTribe.com';
console.log(str.length);

11

The length property returns character count of the output string, not the input string. Have a look:


var str = '\u00a9 PiTribe.com';
console.log(str);
var len = str.length;
console.log(len);

© PiTribe.com 13

As the string \u00a9 PiTribe.com contains 18 characters, if we count, before assigned to str, but returned 13. This is because \u00a9 is treated as one character only because this is a unicode character for copyright symbol ©.

string charCode

string charCodeAt

string concat

concat function combines two string:


var str = 'PiTribe';
var txt = 'Tutorial';
var combined = str.concat(txt);
console.log(combined);

PiTribeTutorial

There is no change in str and txt variables because concat returns the combined string without effecting original strings being joined.

We can add as much arguments as much required.


var str = 'PiTribe';
var txt = 'Tutorial';
var combined = str.concat(' ', txt);
console.log(combined);

PiTribe Tutorial

In the example above, we added blank space ' ' as argument before txt.

string endsWith

endsWith checks either a string has the searchString at end of the string.


var str = 'PiTribe';
var searchString = 'be';
var endPosition = 0;

var ends = str.endsWith(searchString, endPosition);

if(ends)
	console.log('Ends with string')
else
	console.log('Does not end with string');

Ends with string

In the example, looking for searchString be in str from the endPosition.
endPosition is 0-based index

JS: String | JavaScript

JavaScript String

JavaScript String Unicode

Single or double Quotes in string

string length

string charCode

string charCodeAt

string concat

string endsWith

string includes

string lastIndexOf

string match

string padEnd

string padStart

string replace

string split

string substr

string substring

string toLowerCase

string toUpperCase

string trim

string trimStart

string trimEnd

string trimLeft

string trimRight

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