- AtoString()
- BvalueOf()
- CtoLocaleString()
- DtoPrecision()
Javascript Functions MCQ - Quiz
- AA random integer between 0 and 1
- BA random float between 0 and 1
- CA random float between -1 and 1
- DNone of these
- AExecutes a function once after a specified time interval
- B Executes a function repeatedly at a specified time interval
- CStops a function from being executed repeatedly
- DNone of these
- AExtracts a part of a string
- B Replaces a part of a string with a new string
- CConcatenates two strings
- DNone of these
- AEncodes a string as a URI component
- BDecodes a URI component as a string
- CRemoves special characters from a string
- Dnone of these
- AA function that is executed after a certain event occurs
- BA function that is passed as an argument to another function
- CA function that is executed immediately
- DNone of these
- A A function that returns an iterator
- B A function that yields a value
- C A function that does both of the above
- DNone of these
- Acalculates the area of a circle
- Bconverts a string to uppercase
- Cchecks if a string is a palindrome
- Dsorts an array in ascending order
- A the global object
- B the function itself
- Cthe object that the function is a property of
- D the object that the function is called on
- Athe global object
- B the function itself
- C the object that the function is a property of
- Dthe object that the function is called on
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Javascript Functions MCQ - Quiz
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- A. toString()
- B. valueOf()
- C. toLocaleString()
- D. toPrecision()
Remarks:
Explanation:
valueOf() is a method that is available on many JavaScript objects, and it returns the primitive value of the object.
For example, if you have a number object x that was created using the Number constructor,
you can use the valueOf() method to get the primitive value of x.
Here's an example:
let x = new Number(5);
console.log(x.valueOf()); // Output: 5
- A. A random integer between 0 and 1
- B. A random float between 0 and 1
- C. A random float between -1 and 1
- D. None of these
Remarks:
Explanation:
The Math.random() function returns a random float between 0 and 1.
The Math.random() function returns a random float between 0 and 1 because this is the range of values that the function is designed to return.
The function uses a pseudo-random number generator to generate the random float, which means that the numbers it generates are not truly random, but they are good enough for most purposes.
The Math.random() function is often used to generate random numbers for things like games, simulations, and other applications where a truly random number is not required.
- A. Executes a function once after a specified time interval
- B. Executes a function repeatedly at a specified time interval
- C. Stops a function from being executed repeatedly
- D. None of these
Remarks:
Explanation:
The setInterval() function executes a function repeatedly at a specified time interval (in milliseconds).
To stop the function from being executed, you can use the clearInterval() function.
This is useful when you want to perform a certain task at regular intervals, such as updating a value on a webpage or checking for new data from a server.
The clearInterval() function is used to stop the function from being executed.
It takes the ID of the interval as an argument, which is returned by the setInterval() function when it is called.
- A. Extracts a part of a string
- B. Replaces a part of a string with a new string
- C. Concatenates two strings
- D. None of these
Remarks:
Explanation:
The substring() function extracts a part of a string and returns a new string.
It takes two arguments: the start index and the end index (optional).
The extracted part includes the characters from the start index to the end index (not including the character at the end index).
- A. Encodes a string as a URI component
- B. Decodes a URI component as a string
- C. Removes special characters from a string
- D. none of these
Remarks:
Explanation:
The encodeURIComponent() function encodes a string as a URI component.
It replaces certain characters (such as spaces and special characters) with their encoded version,
which can be safely used in a URI.
- A. A function that is executed after a certain event occurs
- B. A function that is passed as an argument to another function
- C. A function that is executed immediately
- D. None of these
Remarks:
Explanation:
A callback function is a function that is passed as an argument to another function.
It is called (or "executed") when the event that it was passed to occurs.
Callback functions are often used to execute a certain task after an asynchronous operation has completed.
- A. A function that returns an iterator
- B. A function that yields a value
- C. A function that does both of the above
- D. None of these
Remarks:
Explanation:
A generator function is a function that returns an iterator and can yield a value multiple times.
Generator functions are denoted by the * symbol and can be paused and resumed at any time.
They are often used to create asynchronous code that is easier to read and maintain.
- A. calculates the area of a circle
- B. converts a string to uppercase
- C. checks if a string is a palindrome
- D. sorts an array in ascending order
Remarks:
Explanation:
This function takes in a single argument, str, and uses the toLowerCase() method to convert the string to lowercase.
It then uses the split(), reverse(), and join() methods to check if the string is a palindrome (i.e., it reads the same forwards and backwards).
- A. the global object
- B. the function itself
- C. the object that the function is a property of
- D. the object that the function is called on
Remarks:
Explanation:
In this case, the greet function is a property of an object, and the this keyword refers to that object.
- A. the global object
- B. the function itself
- C. the object that the function is a property of
- D. the object that the function is called on
Remarks:
Explanation:
In this case, the greet function is an arrow function, which means that the this keyword is not dynamically bound to the object that the function is called on.
Instead, it refers to the value of this in the surrounding context, which in this case is the global object.