the conditional operator used without assigning the result to a variable

Exploring conditional operators on html canvas, I am seeking a streamlined approach to dynamically change stroke color based on conditions. Online examples have not provided a satisfactory solution in a single line of code.

Currently, without using a conditional operator, I would do it as follows:

if (shape.strokecolor == 'black'){
    shape.strokecolor = 'red';
}
else if (shape.strokecolor == 'red'){
    shape.strokecolor = 'black';
}

In an attempt to enhance this process with a conditional operator, I discovered the following method:

var strokecol = shape.strokecolor == 'black' ? 
                shape.strokecolor = 'red' : 
                shape.strokecolor == 'red' ? 
                shape.strokecolor = 'black' : 
                shape.strokecolor = 'red';

This translates to:

  • Evaluate if stroke color is black
  • If true, change it to red,
  • If false, evaluate if stroke color is red
  • If true, switch it to black,
  • If false, retain red color.

The final line in the conditional statement appears redundant to me and assigning the result to a variable seems unnecessary given that changes still take effect. My intention was to reduce the amount of code using a conditional operator, however, the current implementation does not serve this purpose effectively.

I feel like there might be room for improvement... My main query revolves around the proper usage of conditional operators without mandating assignment to a variable. Additionally, if anyone has insights on refining the existing code efficiently (with or without utilizing a conditional operator), I would greatly appreciate any guidance. Thank you.

Answer №1

Utilize the conditional operator to generate a value rather than causing side effects such as assignments. You can then set that value to the appropriate location. In a scenario where the only available colors are black and red, the code would appear as follows:

shape.strokecolor = shape.strokecolor == 'black' ? 'red' : 'black';

To preserve the original functionality with other colors, you would have to reassign the property to itself like this:

shape.strokecolor = shape.strokecolor == 'black' ? 'red' :
                    shape.strokecolor == 'red' ? 'black' :
                    shape.strokecolor;

However, this approach is not necessarily an improvement over the initial if statement.

Answer №2

Nesting a ternary statement too deeply can have dire consequences.

shape.fillcolor = shape.fillcolor.endsWith('x') ? 'blue' : 'green';

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