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Questions and Answers
What is the primary purpose of using loops in JavaScript?
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?
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?
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?
What is the purpose of the incrementExpression in a for loop?
How many statements are required in a for loop?
How many statements are required in a for loop?
What is the name of the type of loop that is similar to a for loop, but uses a different syntax?
What is the name of the type of loop that is similar to a for loop, but uses a different syntax?
Why is the code that repeats 'hello world' 5 times considered 'ugly'?
Why is the code that repeats 'hello world' 5 times considered 'ugly'?
What is the purpose of using the 'let' keyword in a for loop?
What is the purpose of using the 'let' keyword in a for loop?
What happens to the value of 'i' after the first iteration of a for loop?
What happens to the value of 'i' after the first iteration of a for loop?
How many times will the statements inside a for loop be executed if the condition is 'i < 5'?
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?
What is the alternative way to initialize a for loop to repeat an action 5 times?
Why is it more common to use the for loop in the form 'i = 0' or 'i = 1' and increment 'i'?
Why is it more common to use the for loop in the form 'i = 0' or 'i = 1' and increment 'i'?
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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
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