Website Developer Question:
Download Job Interview Questions and Answers PDF
Tell me what Is The Difference Between Undefined Value And Null Value?
Answer:
<undefined> Vs. <null> value.
1. A variable will have <undefined> value if it has declaration but not assigned any value.
2. A variable will yield a <null> value if assigned with null.
3. <undefined> is a type itself whreeas <null> is an object.
4. <undefined> value is set via JavaScript engine whereas null value is set directly in the code.
1. A variable will have <undefined> value if it has declaration but not assigned any value.
2. A variable will yield a <null> value if assigned with null.
3. <undefined> is a type itself whreeas <null> is an object.
4. <undefined> value is set via JavaScript engine whereas null value is set directly in the code.
Download Website Developer Interview Questions And Answers
PDF
| Previous Question | Next Question |
| Tell me how Do You Distinguish Between An Undefined And Undeclared Variable? | Tell me what Is Z-Index And How Does It Work? |