Page 270 - Web_Application_v2.0_C12_Fb
P. 270
const fruits = ["pear", "pineapple", "guava", "cherry", "olive"]; document.write(fruits.
reverse());
Output: olive,cherry,guava,pineapple,pear
4. Explain the unshift() method in JavaScript.
Ans. The unshift( ) method inserts new elements at the beginning of an array. The original array is overwritten.
For example:
const col1 = ["blue","green","orange","purple"];
col1.unshift("silver", "golden");
document.write(col1);
Output: silver,golden,blue,green,orange,purple.
5. Write the differences between substring() and slice() functions in JavaScript.
Ans. substring(): extracts characters between two indices.
var str = "JavaScript";
var result = str.substring(4, 10);
document.write(result);
Output:
Script
slice(): extracts a part of a string and returns it as a new string.
var str = "Hello World";
var result = str.slice(0, 5);
document.write(result);
Output:
Hello
6. How can you determine the number of characters in a string?
Ans. You can determine the number of characters in a string using the .length property in JavaScript.
For example:
var text = "Hello, World!";
document.writetext.length);
// Output: 13
The .length property returns the total count of characters, including spaces and special symbols.
7. What will be the Output of the following code: [CBSE Handbook]
<!DOCTYPE HTML>
<HTML>
<BODY>
<H2>JavaScript Functions</H2>
<P ID="demo1"></P>
<P ID="demo2"></P>
<SCRIPT>
var x=170
function myFunction()
{
var x=45
document.getElementById("demo1").innerHTML = x
268 Touchpad Web Applications (Ver. 2.0)-XII

