What are all the types of Pop up boxes available in JavaScript?
Alert Confirm and Prompt
What is an undefined value in JavaScript?
Undefined value means the Variable used in the code doesn’t exist Variable is not assigned to any value Property does not exist.
What is the function of the delete operator?
The delete keyword is used to delete the property as well as its value. Example var student= {age:20, batch:"ABC"}; Delete student. age;
What do you mean by NULL in Javascript?
The NULL value is used to represent no value or no object. It implies no object or null string, no valid boolean value, no number, and no array object.
How to detect the operating system on the client machine?
In order to detect the operating system on the client machine, the navigator. Platform string (property) should be used.
What would be the result of 3+2+”7″?
Since 3 and 2 are integers, they will be added numerically. And since 7 is a string, its concatenation will be done. So the result would be 57.
Difference between “==” and “===”?
“==” checks only for equality in value, whereas “===” is a stricter equality test and returns false if either the value or the type of the two variables are different.
How can you convert the string of any base to an integer in JavaScript?
The parseInt() function is used to convert numbers between different bases. parseInt() takes the string to be converted as its first parameter. The second parameter is the base of the…
What is called Variable typing in Javascript?
Variable typing is used to assign a number to a variable. The same variable can be assigned to a string. Example: i = 10; i = "string;" This is called…
What are all the looping structures in JavaScript?
Following are looping structures in Javascript: For While Do-while loops