2. While syntax. SyntaxError: Unexpected token, help please!


#1

var understand = true;

while(understand){
console.log("I'm learning while loops!"); }
understand = false;
}
}
}


#2

@webninja69180,
The WHILE-loop
has a condition encapsulated in a pair of parentheses-( )
and a code-block encapsulated in a pair of curly-brackets-{ }
thus
with your

while(understand){
        //code-block
	console.log("I'm learning while loops!");
        understand = false;
}

you would have a complete WHILE-loop definition
and sub-sequent closing-curly-brackets-} are not needed nor expected by the Javascript interpreter.

=====================================================

+++ while loop explained ++++ 3/11 +++++++

What they are trying to achieve,
that you are able to use a while-loop.

             point of entry
             in while-loop
                   |
                   V
 ->  while ( condition===true )   -->EXIT--->if condition===false
|       {  // begin of while-code-block  
^
|          // your code that will be executed 
|          //       as long as while-condition === true
|
^<- - - } //end of while-code-block, 
                     while-condition is checked again !!

They give you the code:

var understand = true;

while(understand){
	console.log("I'm learning while loops!");
	//Change the value of 'understand' here!
	understand=false;   //<<== you make sure
                               while-condition===false
}

1 You assign true to the variable understand

2 The while-statement -tests the condition-,
--which is the variable understand with its value being true
3 Access is granted to the while-code-block
4 console.log("I'm learning while loops!"); is executed.
5 assignment of the false value to the variable understand
6 END of while-code-block is reached,
goto 2 //The while-statement -tests the condition-, understand

As understand renders to false,
the while will NOT execute its body,
and will EXIT.

Reference::

google search
== the Book ==
javascript while site:developer.mozilla.org
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Statements/while

== discussions / opinions ==
javascript while vs do while site:stackoverflow.com
http://stackoverflow.com/questions/5599027/the-do-while-statement

== guidance ==
www.crockford.com
http://javascript.crockford.com/code.html
http://javascript.crockford.com/survey.html
https://developer.mozilla.org/en-US/docs/Web/JavaScript/A_re-introduction_to_JavaScript


#3

Thank you for such a good explanation! :slightly_smiling:


#4

Great explanation! Very informative and easy to understand! Thank you!


#5

Cheers for that, dude.


#6

Thank you for such a clear explanation!