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Saud Tauqeer
Courses Plus Student 8,099 Pointswhy isnt there a execution for the while loop?
why is it like this do { // execute code } while (condition);
but not like this do { // execute code } while (condition) { //execute code };
so far i think that do will execute the code once in any case and if the while condition is not true it will keep asking the do again and again until while is = false or conditions are not met.
Steven Parker
229,732 PointsWithout "return num", then "randomNumber" would get "undefined" instead of the number.
Saud Tauqeer
Courses Plus Student 8,099 Pointsim sorry but i still dont get it...
Steven Parker
229,732 PointsPerhaps some time spent experimenting would be more valuable than further explanations.
Saud Tauqeer
Courses Plus Student 8,099 Pointsits not like im not trying im just understanding the concept of return. i searched a lot too
1 Answer
Steven Parker
229,732 PointsA loop has only one code block that repeats. In a standard "while" loop, the block comes after the "while". But in a "do...while" loop, the block comes between the "do" and the "while".
You are correct that in a "do...while" loop, the block will always be executed at least one time.
Saud Tauqeer
Courses Plus Student 8,099 Pointsthank you
Saud Tauqeer
Courses Plus Student 8,099 Pointsone more thing why is there a return num in the function? var randomNumber = getRandomNumber(10); var guess; var guessCount = 0;
function getRandomNumber( upper ) { var num = Math.floor(Math.random() * upper) + 1; return num; }
Steven Parker
229,732 PointsThe "return num" gives the random number just created back to the part of the program that called the function.
Saud Tauqeer
Courses Plus Student 8,099 Pointsso basically return num stops the function from running again and stores the value of random num generated when the getrandomnumber function first ran and as the function has a return value it wont run again because the value is stored in num? or im entirely wrong.
Steven Parker
229,732 PointsThe "getRandomNumber" function has no loop, so it won't "run again" unless it is called again.
The "return" is only used to pass back the value in "num". The code that called it stores it in "randomNumber".
Saud Tauqeer
Courses Plus Student 8,099 PointsSaud Tauqeer
Courses Plus Student 8,099 Pointsso what would happen if we dont use return num i mean the value of the function is already stored in num or it isnt? var num = Math.floor(Math.random() * upper) + 1;