For loop

Question 1

What is the syntax for a basic for loop in TypeScript?

Answer 1

for (initialization; condition; increment) { // code to execute }

Question 2

True or False: The initialization section of a for loop is optional in TypeScript.

Answer 2

True

Question 3

Fill in the blank: In a for loop, the _____ section is executed after each iteration.

Answer 3

increment

Question 4

What keyword can be used to declare the loop variable in a TypeScript for loop?

Answer 4

let or const

Question 5

In TypeScript, what is the purpose of the condition in a for loop?

Answer 5

To determine whether to continue executing the loop.

Question 6

What is the syntax for a “for …of loop” in TypeScript?

Answer 6

let arr = [10, 20, 30, 40];

for (var val of arr) {
  console.log(val); // prints values: 10, 20, 30, 40
}

Question 7

What is the purpose of the for…of loop in TypeScript?

Answer 7

The for…of loop is used to iterate over iterable objects such as arrays, strings, and other collections.

Question 8

True or False: The for…of loop can be used to iterate over the keys of an object.

Answer 8

False

Question 9

Fill in the blank: The syntax for a for…of loop is ‘for (const ____ of iterable) { }’.

Answer 9

element

Question 10

Which of the following can be used with a for…of loop?
A) Array

B) Object

C) String

Answer 10

A and C (Array and String)

Question 11

Write a short code snippet using a for…of loop to print each element of an array.

Answer 11

const arr = [1, 2, 3]; for (const num of arr) { console.log(num); }

Question 12

What does the for…in loop iterate over in TypeScript?

Answer 12

The for…in loop iterates over the enumerable properties of an object.

Question 13

True or False: The for…in loop can be used to iterate over arrays in TypeScript.

Answer 13

True, but it’s not recommended due to potential unexpected results.

Question 14

Fill in the blank: The syntax for a for…in loop is: for (____ in object) { }

Answer 14

variable

Question 15

Which of the following is a correct example of a for…in loop?
A)for (let key in obj) { console.log(key); }

B) for (obj as key) { console.log(key); }

C) for (let val of obj) { console.log(val); }

Answer 15

A) for (let key in obj) { console.log(key); }

Question 16

Short Answer: What is a potential drawback of using a for…in loop for iterating over arrays?

Answer 16

It may iterate over properties that are not part of the array, leading to unexpected behavior.