How Does the JavaScript Conditional (Ternary) Operator Work?

Conditional Operator in JavaScript

In JavaScript, you may encounter a statement like this:

hsb.s = max != 0 ? 255 * delta / max : 0;

This line exemplifies the use of the Conditional Operator, also known as the "ternary operator." It has the syntax:

condition ? value-if-true : value-if-false

where:

• condition is the condition to be evaluated
• value-if-true is the value assigned if the condition is true
• value-if-false is the value assigned if the condition is false

In your example:

• condition is max != 0
• value-if-true is 255 * delta / max
• value-if-false is 0

So, the operator works as follows:

• If max is not equal to 0 (i.e., max != 0 returns true), then hsb.s is assigned the value 255 * delta / max.
• Otherwise, if max is equal to 0 (i.e., max != 0 returns false), then hsb.s is assigned the value 0.

This is equivalent to the following if statement:

if (max != 0) {
  hsb.s = 255 * delta / max;
} else {
  hsb.s = 0;
}

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