JS 4.3 Loops

Question 1

Define a ( while ) statement

Answer 1

A ( while ) statement creates a loop that executes a specified statement as long as the test condition evaluates to true.

Question 2

What’s the difference between the ( do ) loop and the ( while ) loop?

Answer 2

The do while loop executes a block a code before the condition is tested. A while loop test its condition first before it executes a block of code.

Question 3

What’s the syntax for a do ( while loop )?

Answer 3

The keyword do, followed by curly braces and then the keyword while followed by parentheses

Question 4

What’s the syntax for a ( for loop)?

Answer 4

Use the keyword ‘for’, followed by parentheses, which hold the initial expression, condition expression and then the increment expression.

Question 5

Define the ( break ) statement

Answer 5

Terminates the current loop, switch, or label statement and transfers program control to the statement following the terminated statement

Question 6

As far as DRY code using JavaScript, what are three big principles?

Answer 6

1. Reduce repetition of code in a program
2. Loops help you write DRY code
3. JavaScript functions embrace the DRY principle

Question 7

Define the ( document.querySelector() ) method

Answer 7

This method returns the first element within the document that matches that specified selector or a group of selectors.