Javascript interview questions part 11
Javascript interview questions part 11
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Total Questions: 20
1. Which method is called right before a field is saved?
Correct Answer is : onBeforeSave()
2. What is the necessity to create a separate file after having an API key?
Correct Answer is : To hold configuration information
3. How many parameters does the API accept?
Correct Answer is : 8
4. What is the purpose of the parameter location?
Correct Answer is : All of the mentioned
5. What will happen if the fvonly parameter is set to 1?
Correct Answer is : Results got for the first view
6. How many reserved words are there in JavaScript?
Correct Answer is : 63
7. What is the purpose of the window.location object in JavaScript?
Correct Answer is : Get the URL and redirect
8. Which of the following method loads a new document?
Correct Answer is : location.assign()
9. Which of the following method will wait for certain milliseconds to execute a specified method?
Correct Answer is : setInterval()
10. What is the method used to stop an execution of a method?
Correct Answer is : both clearInterval() and clearTimeout()
11. What is the meaning of JavaScript Hoisting?
Correct Answer is : Moving declarations to top
12. The function definitions in JavaScript begins with
Correct Answer is : Return type, Function keyword, Identifier and Parentheses
13. Consider the following code snippet function printprops(o) { for(var p in o) console.log(p + ": " + o[p] + "\n"); } What will the above code snippet result ?
Correct Answer is : Returns undefined
14. When does the function name become optional in JavaScript?
Correct Answer is : When the function is defined as expressions
15. What is the purpose of a return statement in a function?
Correct Answer is : Stops executing the function and returns the value
16. What will happen if a return statement does not have an associated expression?
Correct Answer is : It returns the undefined value
17. A function with no return value is called
Correct Answer is : Procedures
18. Consider the following code snippet function hypotenuse(a, b) { function square(x) { return x*x; } return Math.sqrt(square(a) + square(b)); } What does the above code result?
Correct Answer is : Sum of square of a and b
19. Which of the following is the correct code for invoking a function without this keyword at all, and also too determine whether the strict mode is in effect?
Correct Answer is : var strict = (function() { return !this; }());
20. Which is an equivalent code to invoke a function m of class o that expects two arguments x and y?
Correct Answer is : o.m(x,y);
