javascript-loops

Question 1

What is the purpose of a loop?

Answer 1

To run a code block multiple times will the condition is true; repeat an action some number of times

Question 2

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

Answer 2

It tells the loop to run until the counter reaches the specified number

Question 3

What does “iteration” mean in the context of loops?

Answer 3

Each single pass through the sequence to complete the loop

Question 4

When does the condition expression of a while loop get evaluated?

Answer 4

Before each pass through the loop

Question 5

When does the initialization expression of a for loop get evaluated?

Answer 5

Once before the loop begins

Question 6

When does the condition expression of a for loop get evaluated?

Answer 6

Before each loop iteration

Question 7

When does the final expression of a for loop get evaluated?

Answer 7

At the end of each loop iteration

Question 8

Besides a return statement, which exits its entire function block, which keyword exits a loop before its condition expression evaluates to false?

Answer 8

Break

Question 9

What does the ++ increment operator do?

Answer 9

Adds 1 to its operand and returns a value

Question 10

How do you iterate through the keys of an object?

Answer 10

Use a for…in loop

var keys = [ ];
for (var prop in object) {
  keys.push(prop);
}