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

Peter Vanderlind de Oliveira
Peter Vanderlind de Oliveira
7,376 Points
Posted by Peter Vanderlind de Oliveira
Peter Vanderlind de Oliveira
7,376 Points

Blank solution page on "The Refactor Challenge, Part 2"

Why doesn't my code work? I see no problem, but the browser shows a blank page.

Thanks.

var html = '';
var rgbColor;

function colorNum() {
    var numberOne = Math.floor(Math.random() * 256 );
    var numberTwo = Math.floor(Math.random() * 256 );
    var numberThree = Math.floor(Math.random() * 256 );
    var color = 'rgb(' + numberOne + "," + numberTwo + "," + numberThree + ")";

  }

for ( i = 0; i <= 10; i++) {
html += '<div style="background-color:' + colorNum + '"></div>';
}

document.write(html);

2 Answers

Steven Parker
Steven Parker
231,275 Points
Steven Parker
Steven Parker
231,275 Points

I see three problems.

  • your function colorNum is missing a return statement
  • to invoke a function you must have parentheses after the name, even if it takes no arguments
  • an empty <div> might not be displayed by the browser, try putting something inside it
Peter Vanderlind de Oliveira
Peter Vanderlind de Oliveira
7,376 Points
Peter Vanderlind de Oliveira
Peter Vanderlind de Oliveira
7,376 Points

Your first two tips solved the problem. I Guess I didn't really understand the purpose of the return statement.

Thanks, Steven.

The result code for those who need:

var html = '';
var rgbColor;

function colorNum() {
    var numberOne = Math.floor(Math.random() * 256 );
    var numberTwo = Math.floor(Math.random() * 256 );
    var numberThree = Math.floor(Math.random() * 256 );

    return 'rgb(' + numberOne + "," + numberTwo + "," + numberThree + ")";

  }

for ( i = 0; i <= 10; i++) {
html += '<div style="background-color:' + colorNum() + '"></div>';
}

document.write(html);