2.6 lost beyond imagination

 // Function to recursively print the right half of a string
var right = function(str){
var length = str.length;

// Helper function
var help = function(index){
    
    // Recursive Case: Print right half
    if(index<length){
        // Prints characters from index until the end of the array
        console.log(str.substring(index,length));
        // Recursive Call: call help on right half
        help(length-Math.floor((length-index)/2));
    }
    // Base Case: Do Nothing
};

help(0);
};

 // Testing
 var word = "question";
 right(word);

FINALLY SOLVED line 13 help(length-Math.floor((length-index)/2));

So this is much different than what the author had said to do but I got the correct output and credit for the exercise. So the question remains what is the REAL answer. Despite my frustrations I really do love these exercises.

I wrote my if condition like this:

if(index < length ){
    // Prints characters from index until the end of the array
    console.log(str.substring(index, length));
    
    // Recursive Call: call help on right half
    help(Math.ceil( index + (length - index)/ 2));           
} 

…then I came here and noticed what Ruben wrote and, though my math skills are weak, I had to figure out how:

(L + I)/2 was equal to I + (L-I)/2

Here’s that process:

1. I + (L-I)/2 is equal to I + L/2 - I/2
2. I + L/2 - I/2 is equal to 2I/2 + L/2 - I/2
3. 2I/2 + L/2 - I/2 simplifies to I/2 + L/2
4. I/2 + L/2 simplifies again to (I + L)/2

I wish I that had occured to me on my own! Thanks, Ruben.

Well it is not much different, my line was: help(Math.ceil(length-(length-index)/2)); But yeah, the assignment is far from easy :)

That’s all well and good, but what about line 9? I’m not sure what to put in there. My current line 9 is as follows: if(index > 0){ But I think it should be something more like: if(index = 0; index < length; index+=2){ What is line 9 and why?

Thanks, x13420x. I over-complicated the problem.

That’s my code - it’s much simpler but it does the job of printing the right half of a string. However, it’s not accepted as correct. Is it because i reduce the initial string? Any ideas?

var right = function(str){ var length = str.length;
var help = function(index){ if(length>1){ index=length/2; console.log(str.substring(index, length)); str=str.substring(index,length); length=str.length; help(Math.ceil(str)); }

    else {}
};

help(0);

};

var word = “question”; right(word);