JavaScript Strings

0 2396

String refers to a group of characters, enclosed with single or double quotes. JavaScript script elements store text inside it.

Example
var stringFirst = "coding tag is e-leaning platform";
var stringFirst = 'coding tag is e-leaning platform';

There are 2 techniques used to create a string in JavaScript

1. By string literal

Example
<script>
var stringSecond ="Tutorial and Blogging";
document.write(stringSecond);
</script>

Output:
Tutorial and Blogging

2. By string object (through new keyword)

Example
<script>
var stringFirst=new String("Welcome Students");
document.write(stringFirst);
</script>

Output:
Welcome Students

String Methods:

Methods	Description
charAt()	To return value present at a specified value
charCodeAt()	To return unicode value
concat()	To combine two strings
endsWith()	To verify given strings ending with user-specified string or not
fromCharCode()	Unicode values to the characters conversion
includes()	To specify given characters in a strings
lastIndexOf()	Returns last occurrence of a particular value in a string
search()	To search and return a regular expression in a particular string
slice()	To fetch the selected elements of a string
split()	To split a string and return new one
substring()	Returns and extracts a part of a character

// Program demonstrating string

<script>
var stringFirst = "coding tag is e-leaning platform"
var stringSecond = "tutorial and blogging"
// charAt()
console.log(stringFirst.charAt(1));
// charAt()
console.log(stringFirst.charAt(1));
// charCodeAt()
console.log(stringSecond.charCodeAt(1));
// concat()
console.log(stringFirst.concat(stringSecond));
// endsWith()
console.log(stringFirst.endsWith("to"));
// fromCharCode
console.log(stringFirst.fromCharCode(189, 43, 190, 61));
// includes()
console.log(stringSecond.includes("end"));
// indexOf()
console.log(stringSecond.indexOf("end"));
// lastIndexOf()
console.log(stringSecond.lastIndexOf("end"));
// match()
console.log(stringSecond.match(/end/g));
// repeat()
console.log(stringFirst.repeat(3));
// replace()
console.log(stringSecond.replace(/end/g,"End"));
// search()
console.log(stringSecond.search("end"));
// slice()
console.log(stringFirst.slice(2,4));
// split()
console.log(stringFirst.split(" "));
// startswith()
console.log(stringFirst.startsWith("free"));
// substr()
console.log(stringSecond.substr(2,4));
// substring()
console.log(stringSecond.substring(2,4));
// toLowerCase()
console.log(stringFirst.toLowerCase());
// toUpperCase()
console.log(stringFirst.toUpperCase());
// trim()
var stringThree = "Subscribe now";
console.log(stringThree.trim());
</script>