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JavaScript JavaScript Loops, Arrays and Objects Simplify Repetitive Tasks with Loops The Refactor Challenge, Part 2

Posted by john larson
john larson
16,594 Points

for, a basic statement

for (var i = 2; i = 24; i +=2) { console.log(i); } This looks like a very basic straightforward "for" loop to me, but my browser wont display it. I can't even open the console to examine it. It has the starting var, the condition and the counter. What am I missing?

6 Answers

justindennison
justindennison
15,922 Points

Hey John, You are so very close. Based upon your forum post, you have the following code:

for (var i = 2; i = 24; i +=2) { 
    console.log(i); 
}

This does contain expressions for each of the required portions of the for loop as you said. However, notice that the condition portion has a single '=' which then makes it an assignment instead of boolean equality. Moreover, if you did have i == 24 then your loop would not run because 2 == 24 evaluates to false. Try the following and see if you can at least get the loop running:

for(var i = 2; i <=24; i +=2){
     console.log(i); //this should print all of the even numbers from 2 to 24
}

Hope that helps. Happy Coding!

Tyler _
Tyler _
6,651 Points
Tyler _
Tyler _
6,651 Points

agreed, how could i == 24 and i == 2 ??

john larson
john larson
16,594 Points
john larson
john larson
16,594 Points

thanks justin, I haven't noticed the term "assignment" used till you just said that. That makes it work. so then does the conditional part part of a "for" loop always have a "<" or ">" in it?

john larson
john larson
16,594 Points
john larson
john larson
16,594 Points

opps, that last "" was supposed to have a greater than, or less than in it. / Does the conditional part of a for loop always have a greater than/less than part?

john larson
john larson
16,594 Points
john larson
john larson
16,594 Points

holy crap, assign a value = assignment...lol. "if I only had a brain" (sings the scare crow from the wizard of oz). MORE COFFEE PLEASE!

justindennison
justindennison
15,922 Points
justindennison
justindennison
15,922 Points

Hey John, The conditional part just needs to evaluate to true/false. However, if you are manipulating a range of things then you are going to usually use a >/>=/</<= (relational operators). I would caution to not get stuck in that mindset, because there may be other times that you use other conditions as your logic becomes more complex. At the beginning you will typically see the relational operators.

john larson
john larson
16,594 Points
john larson
john larson
16,594 Points

thanks again justin, I appreciate you bringing in the "big picture" concept. So it's not about "this is how you do it", it's about "what does each situation call for". I like it.

justindennison
justindennison
15,922 Points

You are welcome. Context is always important. My driving question behind learning and teaching these things is: "Why should I/you care?" Keep on coding. It comes easier and easier.