JavaScript Objective Questions:
Which company developed JavaScript?
- Netscape
- Microsoft
- IBM
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Which of the following is a JavaScript data type?
- Number
- Character
- Float
- Word
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Which symbol is used for single-line comments in JavaScript?
- < !-- -->
- //
- **
- #
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Which method is used to display data in a dialog box?
- prompt()
- display()
- msg()
- alert()
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Which keyword is used to declare a variable in JavaScript?
- float
- var
- int
- string
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Which operator is used to assign a value to a variable?
- =
- = =
- : =
- ===
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Which of the following is a looping structure in JavaScript?
- for
- while
- do...while
- All of the above
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Which function is used to parse a string to an integer?
- convert()
- stringToInt()
- parseFloat()
- parseInt()
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What does typeof operator do in JavaScript?
- Checks value
- Checks type
- Declares variable
- Converts to string
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What will typeof null return?
- "null"
- "object"
- "undefined"
- "boolean"
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Which method is used to add an element to the end of an array?
- push()
- pop()
- shift()
- unshift()
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How to create a function in JavaScript?
- function = myFunc()
- function myFunc()
- def myFunc()
- create myFunc()
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How to call a function named greet?
- call greet()
- greet();
- greet{}
- call.greet();
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Which built-in method returns the length of a string?
- size()
- length()
- count()
- length
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Which of the following is used for strict equality in JavaScript?
- ==
- ===
- =
- !=
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What is the output of console.log(2 + "2")?
- 4
- "4"
- "22"
- Error
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JavaScript is a _____ language.
- Server-side
- Client-side
- Object-based
- All of the above
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Which event occurs when the user clicks on an HTML element?
- onmouseover
- onclick
- onchange
- onmouseclick
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What does DOM stand for?
- Data Object Method
- Document Object Model
- Document Order Model
- None of the above
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How do you write an if statement in JavaScript?
- If x > y:
- If(x > y)
- if x > y then
- ) if x > y {}
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