JavaScript Functions
JavaScript Functions - Important Points
| 36. | Which of the following is a higher-order function in JavaScript? |
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A. parseInt()
B. setTimeout()
C. Math.abs()
D. Object.keys()
View Answer Discuss Work SpaceAnswer: option b
Explanation:
A higher-order function is a function that takes a function as an argument or returns a function. setTimeout() is an example of a higher-order function that takes a function as an argument.
| 37. | What is the output of the following code snippet? var x = 2; |
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A. 2, 3
B. 3, 2
C. 2, 2
D. 3, 3
View Answer Discuss Work SpaceAnswer: option b
Explanation:
The variable x is declared outside the function with a value of 2. Inside the function, a new variable x is declared with a value of 3, which is then logged to the console. Outside the function, the original variable x with a value of 2 is logged to the console.
| 38. | What is the output of the following code snippet? function myFunction(x) { |
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A. 2
B. 3
C. undefined
D. Error
View Answer Discuss Work SpaceAnswer: option a
Explanation:
The function myFunction takes a parameter x and adds 1 to it. However, the function call myFunction(y) does not update the value of y outside the function, so the output is still 2.
| 39. | Which of the following is not a JavaScript function declaration method? |
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A. Function constructor
B. Function expression
C. Function literal
D. Function prototype
View Answer Discuss Work SpaceAnswer: option d
Explanation:
Function prototype is not a JavaScript function declaration methoIt is a property of the function object that can be used to add properties and methods to all instances of the function.