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JavaScript Loops

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Questions and Answers

What is the primary purpose of using loops in JavaScript?

To repeat an action a number of times (correct)

To make the code more concise

To make the code more complex

To eliminate the need for conditional statements

What is the name of the variable commonly used in for loops?

index

i (correct)

loopVariable

counter

What is the purpose of the condition in a for loop?

To modify the loop variable's value

To determine when the loop should stop (correct)

To initialize the loop variable

To increment the loop variable

What is the purpose of the incrementExpression in a for loop?

To increment the loop variable Signup and view all the answers

How many statements are required in a for loop?

3 Signup and view all the answers

What is the name of the type of loop that is similar to a for loop, but uses a different syntax?

For in loop Signup and view all the answers

Why is the code that repeats 'hello world' 5 times considered 'ugly'?

It repeats the same code multiple times Signup and view all the answers

What is the purpose of using the 'let' keyword in a for loop?

To declare a local variable Signup and view all the answers

What happens to the value of 'i' after the first iteration of a for loop?

It is incremented by 1 Signup and view all the answers

How many times will the statements inside a for loop be executed if the condition is 'i < 5'?

What is the alternative way to initialize a for loop to repeat an action 5 times?

Initialize 'i' to 0 and check if 'i' is less than or equal to 5 Signup and view all the answers

Why is it more common to use the for loop in the form 'i = 0' or 'i = 1' and increment 'i'?

It is more intuitive Signup and view all the answers

Study Notes

Loops in JavaScript

Loops are used to repeat an action a number of times
There are different types of loops in JavaScript: For loops, While loops, Do-While loops, For-In loops, and For-Of loops

For Loops

A For loop consists of three statements: initialExpression, condition, and incrementExpression
initialExpression: declares and initializes a variable (e.g. let i = 0)
condition: checks if the loop should continue (e.g. i < 5)
incrementExpression: increments the loop variable (e.g. i++)

How For Loops Work

The loop executes as long as the condition is true
After each iteration, the incrementExpression is executed, and the condition is evaluated again
The loop stops when the condition is false

Examples of For Loops

Displaying "Hello World" 5 times on the console
Displaying the odd numbers between 1 and 5
Looping in reverse order (e.g. starting from 5 and going back to 1)

Key Points

The loop variable (e.g. i) is incremented after each iteration
The condition determines when the loop should stop
For loops can be used to repeat an action a number of times, with different starting and ending points