Intro: Loops

Which loop is guaranteed to execute its body at least once?

• The while loop

• The for...in loop

• The do...while loop

• The standard for loop

Answer explanation

A do...while loop checks its condition after the body runs, so the body always executes at least once. A while loop checks the condition first and may skip the body entirely.

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Blooms Level: Remember

Which loop is best suited for iterating over the keys of an object?

• The while loop

• The for...in loop

• The for loop

• The do...while loop

Answer explanation

The for...in loop is designed to iterate over an object's enumerable property keys. A regular for loop iterates by numeric index, not by key name.

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Blooms Level: Remember

What does the break statement do inside a loop?

• Skips the current iteration only

• Restarts the loop from the first iteration

• Pauses the loop until a condition is met

• Exits the loop immediately and completely

Answer explanation

break exits the loop entirely, stopping all further iterations. Students often confuse it with continue, which skips only the current iteration and keeps the loop running.

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Blooms Level: Remember

What does the continue statement do inside a loop?

• Exits the loop entirely

• Restarts the loop from zero

• Skips the current iteration's remaining code

• Pauses execution for user input

Answer explanation

continue skips remaining code in the current iteration and jumps back to the loop's condition check. It does not exit the loop like break does.

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Blooms Level: Remember

A developer wants to loop through a list of product prices exactly 5 times. Which loop structure fits best?

• A for...in loop over the prices array

• A for loop with a counter from 0 to 4

• A do...while loop with no upper limit

• A while loop with no counter variable

Answer explanation

A for loop with a defined counter is the standard choice when the number of iterations is known in advance. for...in is for object keys, not array index iteration.

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Blooms Level: Apply