2. JavaScript String
The JavaScript string is an object that represents a sequence of
characters.
There are 2 ways to create string in JavaScript
1. By string literal
2. By string object (using new keyword)
3. By string literal
The string literal is created using double quotes
1. <script>
2. var str="This is string literal";
3. document.write(str);
4. </script>
4. By string object (using new keyword)
1. Here, new keyword is used to create instance of string.
2. <script>
3. var stringname=new String("hello javascript string");
4. document.write(stringname);
5. </script>
5. JavaScript String charAt(index) Method
The JavaScript String charAt() method returns the character at the given
index.
1. <script>
2. var str="javascript";
3. document.write(str.charAt(2));
4. </script>
6. JavaScript String concat(str) Method
1. The JavaScript String concat(str) method concatenates or joins two strings.
2. <script>
3. var s1="javascript ";
4. var s2="concat example";
5. var s3=s1.concat(s2);
6. document.write(s3);
7. </script>
7. JavaScript String indexOf(str) Method
1. <script>
2. var s1="javascript from javatpoint indexof";
3. var n=s1.indexOf("from");
4. document.write(n);
5. </script>
8. JavaScript String lastIndexOf(str)
Method
The JavaScript String lastIndexOf(str) method returns the last index
position of the given string.
1. <script>
2. var s1="javascript from javatpoint indexof";
3. var n=s1.lastIndexOf("java");
4. document.write(n);
5. </script>
9. JavaScript String toLowerCase()
Method
1. The JavaScript String toLowerCase() method returns the given string in
lowercase letters.
2. <script>
3. var s1="JavaScript toLowerCase Example";
4. var s2=s1.toLowerCase();
5. document.write(s2);
6. </script>
10. JavaScript String toUpperCase()
Method
The JavaScript String toUpperCase() method returns the given string in
uppercase letters.
1. <script>
2. var s1="JavaScript toUpperCase Example";
3. var s2=s1.toUpperCase();
4. document.write(s2);
5. </script>
11. JavaScript String slice(beginIndex, endIndex) Method
The JavaScript String slice(beginIndex, endIndex) method returns the parts
of string from given beginIndex to endIndex.
In slice() method, beginIndex is inclusive and endIndex is exclusive.
1. <script>
2. var s1="abcdefgh";
3. var s2=s1.slice(2,5);
4. document.write(s2);
5. </script>
12. JavaScript String trim() Method
1. <script>
2. var s1=" javascript trim ";
3. var s2=s1.trim();
4. document.write(s2);
5. </script>
13. JavaScript String split() Method
1. <script>
2. var str="This is JavaTpoint website";
3. document.write(str.split(" ")); //splits the given string.
4. </script>
14. JavaScript Date Object
The JavaScript date object can be used to get year, month and day. You
can display a timer on the webpage by the help of JavaScript date object.
You can use different Date constructors to create date object. It provides
methods to get and set day, month, year, hour, minute and seconds.
Constructor
You can use 4 variant of Date constructor to create date object.
1. Date()
2. Date(milliseconds)
3. Date(dateString)
4. Date(year, month, day, hours, minutes, seconds, milliseconds
15. JavaScript Date Methods
1. Current Date and Time: <span id="txt"></span>
2. <script>
3. var today=new Date();
4. document.getElementById('txt').innerHTML=today;
5. </script>
16. JavaScript Date Methods
1. <script>
2. var date=new Date();
3. var day=date.getDate();
4. var month=date.getMonth()+1;
5. var year=date.getFullYear();
6. document.write("<br>Date is: "+day+"/"+month+"/"+year);
7. </script>
17. JavaScript Current Time Example
1. Current Time: <span id="txt"></span>
2. <script>
3. var today=new Date();
4. var h=today.getHours();
5. var m=today.getMinutes();
6. var s=today.getSeconds();
7. document.getElementById('txt').innerHTML=h+":"+m+":"+s;
8. </script>
