Loop Exam Questions & Answers 2024/2025

Loop Exam Questions & Answers
2024/2025

- ANSWERSLoops can execute a block of code a number of times.



JavaScript Loops - ANSWERSJavaScript Loops



- ANSWERSLoops are handy, if you want to run the same code over and over again, each time with a
different value.



- ANSWERSOften this is the case when working with arrays:



- ANSWERSInstead of writing:

text += cars[0] + "<br>";

text += cars[1] + "<br>";

text += cars[2] + "<br>";

text += cars[3] + "<br>";

text += cars[4] + "<br>";

text += cars[5] + "<br>";



You can write:

for (i = 0; i < cars.length; i++) {

text += cars[i] + "<br>";

}



Different Kinds of Loops - ANSWERSDifferent Kinds of Loops



- ANSWERSJavaScript supports different kinds of loops:

, for - loops through a block of code a number of times

for/in - loops through the properties of an object

while - loops through a block of code while a specified condition is true

do/while - also loops through a block of code while a specified condition is true



The For Loop - ANSWERSThe For Loop



- ANSWERSThe for loop is often the tool you will use when you want to create a loop.



- ANSWERSThe for loop has the following syntax:

for (statement 1; statement 2; statement 3) {

code block to be executed

}



- ANSWERSStatement 1 is executed before the loop (the code block) starts.



Statement 2 defines the condition for running the loop (the code block).



Statement 3 is executed each time after the loop (the code block) has been executed.



- ANSWERSExample

for (i = 0; i < 5; i++) {

text += "The number is " + i + "<br>";

}



- ANSWERSFrom the example above, you can read:



Statement 1 sets a variable before the loop starts (var i = 0).