Welcome to the Treehouse Community

Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.

Start your free trial

JavaScript

olu adesina
olu adesina
23,007 Points
Posted by olu adesina
olu adesina
23,007 Points

can i use a for in loop within a for loop

 {name:'Olu Adesina',
  track:'javaScript',
  achievements:'loops,objects',
  points:1568},

  {name:'Olu Adesina',
  track:'javaScript',
  achievements:'loops,objects',
  points:1568},

  {name:'Olu Adesina',
  track:'html',
  achievements:'loops,objects',
  points:1568},

  {name:'Olu Adesina',
  track:'javaScript',
  achievements:'loops,objects',
  points:1568},

  {name:'jack Adesina',
  track:'javaScript',
  achievements:'loops,objects',
  points:1568},


]
  var message;

  for(x=0;x<students.length;x+=1){
      for(var name in[x]){
      message+= name, ':',[x][name]     
  }
}

  document.write(message)

2 Answers

Steven Parker
Steven Parker
229,744 Points
Steven Parker
Steven Parker
229,744 Points

Sure you can.

But I don't think your inner loop is properly formed. And if I understand what you're intending to do here, you probably meant to write something like this:

for (x = 0; x < students.length; x += 1) {
  for (var name in students[x]) {
    message += name + ": " + students[x][name] + "<br>";
  }
  message += "<br>";
}

Also, since you want to append to it, when you declare message you should initialize it with an empty string.

evannex
evannex
2,436 Points
evannex
evannex
2,436 Points

The simple answer is yes you can definitely use a for loop inside another for loop. However, in your code above, the inner for loop is not structured correctly. In this case I believe the inner for could be swapped for an if statement to achieve the desired functionality.